the present invention provides compounds that are represented by the formula i wherein each r 1 and r 2 are independently hydrogen , c 1 - c 8 - straight or branched alkyl or c 3 - c 8 - cycloalkyl ; or wherein r 1 and r 2 and the nitrogen to which they are attached form azetidine , piperidine , pyrrolidine , azapane or morpholine ; wherein each r 3 is independently hydrogen , c 1 - c 8 - straight or branched alkyl , c 1 - c 5 - alkoxy , c 1 - c 8 - straight or branched polyfluoroalkyl , halogen , cyano , hydroxyl , tetrazole - optionally substituted with methyl , or amino ; or wherein two r 3 groups on adjacent carbons combine together to form a methylenedioxy linker ; wherein r 4 is hydrogen , c 1 - c 8 - straight or branched alkyl or c 3 - c 8 - cycloalkyl ; wherein each r 5 is hydrogen , halogen , c 1 - c 5 - alkoxy , c 1 - c 8 - straight or branched alkyl , c 1 - c 8 - straight or branched polyfluoroalkyl , cyano , or hydroxyl ; wherein r 6 is hydrogen , c 1 - c 8 - straight or branched alkyl or phenyl ; in one embodiment the compounds represented by the formula i are the pure enantiomers , diasteromers and mixtures thereof . in another embodiment the compound represented by the formula i is the cis isomer of formula ii and iii ; in another embodiment the compound represented by the formula i is the trans isomer of formula iv and v . in another embodiment , the present invention relates to compounds of the formula ii - v wherein r 1 , r 2 , r 3 , r 4 , r 5 , r 6 , m and n are as defined above . in one embodiment r 1 is hydrogen . in one embodiment r 2 is methyl . in one embodiment r 4 is hydrogen . in one embodiment r 3 is selected form the group consisting of hydrogen , halogen , and methoxy . in one embodiment r 3 is a hydrogen or halogen . in one embodiment the halogen is fluorine or chlorine . in one embodiment r 5 and r 6 are hydrogen . in another embodiment r 1 is hydrogen and r 2 , r 3 , r 4 , r 5 , and r 6 are as defined above in formulas ii - v . in a further embodiment r 1 is hydrogen , r 2 is methyl , r 3 , r 4 , r 5 and r 6 are as defined above in formulas ii - v . in a further embodiment , r 1 is hydrogen , r 2 is methyl , r 4 is hydrogen , and r 3 , r 5 and r 6 are as defined above in formulas ii - v . in a further embodiment , r 1 is hydrogen , r 2 is methyl , r 4 is hydrogen , r 3 is hydrogen , halogen or methoxy , and the halogen is selected from the group consisting of fluoro or chloro , and r 5 and r 6 are as defined above in formulas ii - v . in a further embodiment , r 1 is hydrogen , r 2 is methyl , r 4 is hydrogen , r 3 is hydrogen , halogen or methoxy , and the halogen is selected from the group consisting of fluoro or chloro , and r 5 and r 6 are hydrogen . in a further embodiment , the present invention relates to compounds of the formula vi - x as used herein , it is understood that compounds of formula i - x are meant to include all the examples exemplified herein . in the present invention the term halogen means fluoro , chloro , bromo or iodo . in the present invention , the term “ c 1 - c 8 straight or branched alkyl ” refers to a saturated hydrocarbon having from one to eight carbon atoms inclusive . examples of such substituents include , but are not limited to , methyl , ethyl , 1 - propyl , 2 - propyl , 1 - butyl , 2 - butyl , 2 - methyl - 2 - propyl , 2 - methyl - 1 - propyl , n - pentyl and n - octyl . furthermore , the term “ c 3 - c 8 cycloalkyl ” refers to a saturated cyclohydrocarbon ring having from three to eight carbon atoms inclusive . included within this term are cyclopropyl , cyclobutyl , cyclopentyl , cyclohexyl , cyclohexyl and cyclooctyl . the term “ c 1 - c 5 - alkoxy ” refers to a saturated alkoxy group having from one to five carbon atoms inclusive with the open valency on the oxygen . examples of such substituents include , but are not limited to , methoxy , ethoxy , n - butoxy , t - butoxy and n - pentyloxy . the term “ c 1 - c 8 straight or branched polyfluoroalkyl ” refers to a saturated hydrocarbon having from one to eight carbon atoms inclusive substituted with one or more fluorine atoms . examples of such substituents include , but are not limited to , trifluoromethyl , pentafluoroethyl , 1 - fluoroethyl and 1 , 2 - difluoroethyl and 2 , 3 - difluorooctyl . a “ therapeutically effective amount ” of a compound as used herein means an amount sufficient to cure , alleviate or partially arrest the clinical manifestations of a given disease and / or its complications . an amount adequate to accomplish this is defined herein as “ therapeutically effective amount ”. effective amounts for each purpose will depend on the severity of the disease or injury as well as the weight and general state of the subject . it will be understood that determining an appropriate dosage may be achieved using routine experimentation , by constructing a matrix of values and testing different points in the matrix , which is all within the ordinary skills of a trained physician . the term “ treatment ” and “ treating ” as used herein means the management and care of a patient for the purpose of combating a condition , such as a disease or a disorder . the term is intended to include the full spectrum of treatments for a given condition from which the patient is suffering , such as administration of the active compound to alleviate the symptoms or complications , to delay the progression of the disease , disorder or condition , to alleviate or relief the symptoms and complications , and / or to cure or eliminate the disease , disorder or condition as well as to prevent the condition , wherein prevention is to be understood as the management and care of a patient for the purpose of combating the disease , condition , or disorder and includes the administration of the active compounds to prevent the onset of the symptoms or complications . nonetheless , prophylactic ( preventive ) and therapeutic ( curative ) treatment are two separate aspect of the invention . the patient to be treated , i . e . the patient in need thereof , may be a mammal , in particular a human being . the salts of the invention are may be acid addition salts . the acid addition salts of the invention are may be pharmaceutically acceptable salts of the compounds of the invention formed with non - toxic acids . acid addition salts include salts of inorganic acids as well as organic acids . examples of suitable inorganic acids include hydrochloric , hydrobromic , hydroiodic , phosphoric , sulfuric , sulfamic , nitric acids and the like . examples of suitable organic acids include formic , acetic , trichloroacetic , trifluoroacetic , propionic , benzoic , cinnamic , citric , fumaric , glycolic , itaconic , lactic , methanesulfonic , maleic , malic , malonic , mandelic , oxalic , picric , pyruvic , salicylic , succinic , methane sulfonic , ethanesulfonic , tartaric , ascorbic , pamoic , bismethylene salicylic , ethanedisulfonic , gluconic , citraconic , aspartic , stearic , palmitic , edta , glycolic , p - aminobenzoic , glutamic , benzenesulfonic , p - toluenesulfonic acids , theophylline acetic acids , as well as the 8 - halotheophyllines , for example 8 - bromotheophylline and the like . further examples of pharmaceutical acceptable inorganic or organic acid addition salts include the pharmaceutically acceptable salts listed in j . pharm . sci . 1977 , 66 , 2 , which is incorporated herein by reference . examples of metal salts include lithium , sodium , potassium , magnesium salts and the like . examples of ammonium and alkylated ammonium salts include ammonium , methyl -, dimethyl -, trimethyl -, ethyl -, hydroxyethyl -, diethyl -, n - butyl -, sec - butyl -, tert - butyl -, tetramethylammonium salts and the like . further , the compounds of this invention may exist in unsolvated as well as in solvated forms with pharmaceutically acceptable solvents such as water , ethanol and the like . in general , the solvated forms are considered equivalent to the unsolvated forms for the purposes of this invention . the compounds of the present invention may have one or more asymmetric centres and it is intended that any isomers ( i . e . enantiomers or diastereomers ), as separated , pure or partially purified and any mixtures thereof including racemic and diastereomeric mixtures , i . e . a mixture of stereoisomers , are included within the scope of the invention . racemic forms can be resolved into the optical antipodes by known methods , for example , by fractional separation of diastereomeric salts thereof with an optically active acid , and liberating the optically active amine compound by treatment with a base . another method for resolving racemates into the optical antipodes is based upon chromatography on an optically active matrix . the compounds of the present invention may also be resolved by the formation of diastereomeric derivatives . additional methods for the resolution of optical isomers , known to those skilled in the art , may be used . such methods include those discussed by j . jaques , a . collet and s . wilen in “ enantiomers , racemates , and resolutions ”, john wiley and sons , new york ( 1981 ). optically active compounds can also be prepared from optically active starting materials , by stereoselective synthesis or by enzymatic resolution . the pharmaceutical compositions of this invention , or those which are manufactured in accordance with this invention , may be administered by any suitable route , for example orally in the form of tablets , capsules , powders , syrups , etc ., or parenterally in the form of solutions for injection . for preparing such compositions , methods well known in the art may be used , and any pharmaceutically acceptable carriers , diluents , excipients or other additives normally used in the art may be used . tablets may be prepared by mixing the active ingredient with ordinary adjuvants and / or diluents and subsequently compressing the mixture in a conventional tabletting machine . examples of adjuvants or diluents comprise : corn starch , potato starch , talcum , magnesium stearate , gelatine , lactose , gums , and the like . any other adjuvants or additives usually used for such purposes such as colourings , flavourings , preservatives etc . may be used provided that they are compatible with the active ingredients . solutions for injections may be prepared by dissolving the active ingredient and possible additives in a part of the solvent for injection , such as sterile water , adjusting the solution to desired volume , sterilizing the solution and filling it in suitable ampules or vials . any suitable additive conventionally used in the art may be added , such as tonicity agents , preservatives , antioxidants , etc . conveniently , the compounds of the invention may be formulated in a unit dosage form , each dosage containing from about 0 . 01 to about 1000 mg , or from about 0 . 05 to about 5000 , or from about 0 . 1 to about 1000 mg , the actual dosage may however vary e . g . according to the specific compound . the term “ unit dosage form ” refers to physically discrete units suitable as unitary dosages for human subjects and other mammals , each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect , in association with one or more pharmaceutically acceptable carriers , diluents , excipients or other additives normally used in the art . the compounds of the invention are effective over a wide dosage range . for example , dosages per day normally fall within the range of about 0 . 01 to about 100 mg / kg of body weight , or within the range of about 0 . 1 to about 75 mg / kg . however , it will be understood that the amount of the compound actually administered will be determined by a physician , according to the relevant circumstances , including the condition to be treated , the chosen route of administration , the actual compound administered , the age , weight , and response of the individual patient , and the severity of the patient &# 39 ; s symptoms , and therefore the above dosage ranges are not intended to limit the scope of the invention in any way . in some instances dosage levels below the lower limit of the aforesaid range may be more than adequate , while in other cases still larger doses may be employed without causing any harmful side effect , provided that such larger doses are first divided into several smaller doses for administration throughout the day . all references cited throughout the specification are hereby incorporated by reference in their entirety . 7 - fluoroindole was synthesized according to : bartoli , guiseppe ; palmieri , gianni ; bosco , marcella ; dalpozzo , renato ; tetrahedron lett ., 30 , 16 , 1989 , 2129 - 2132 . 3 - bromo - indan - 1 - ones of general formula xi are treated with a base such as triethylamine to form inden - 1 - ones of general formula xii . treatment of inden - 1 - ones of general formula xii with indoles of general formula xiii in the presence of a lewis acid catalyst such as scandium triflate or copper triflate give 3 -( 1h - indol - 3 - yl )- indan - 1 - ones of general formula xiv . cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formula xv are prepared as shown in scheme 2 . 3 -( 1h - indol - 3 - yl )- indan - 1 - ones of general formula xiv are treated with a reducing agent such as sodium borohydride to give cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formula xv . cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formula xv are resolved into their enantiomers as shown in scheme 3 . cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formula xv are resolved into their enantiomers by treatment of racemic cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols with an irreversible acyl donor such as vinyl butyrate in the presence of a lipase such as novozym 435 ( availabale from novozymes a / s , krogshoejvej 36 , 2880 bagsvaerd , denmark ). one enantiomer is then esterificated to form ester of general formula xvi while the other enantiomer of general formula xvii is left unreacted . the compounds of general formulae xvi and xvii are separated by standard chromatographic techniques . optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formula xviii are obtained by hydrolysis of esters of general formula xvi or by treatment of esters of general formula xvi with a transesterification reagent such as sodium methoxide in methanol as shown in scheme 4 . optically active cis - 3 -( 1h - indol - 3 - yl )- indan - l - ols of general formulae xvii and xviii are oxidized by an oxidant such as the dess - martin periodane to give optically active 3 -( 1h - indol - 3 - yl )- indan - 1 - ones general formulae xix and xx as shown in scheme 5 . trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxi are prepared as shown in scheme 6 . treatment of racemic cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formulae xv or treatment of optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formulae xvii or xviii with an azidating reagent such as diphenyl phosphoryl azide and a base such as dbu provides racemic or optically active trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxi , respectively . trans -[ 3 -( 3 - azido - indan - 1 - yl )- indol - 1 - yl ]- phosphonic acid diphenyl esters of general formula xxii are prepared as shown in scheme 7 . treatment of racemic cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formulae xv with r 4 ═ h or treatment of optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formulae xvii or xviii with r 4 ═ h with an excess of diphenyl phosphoryl azide and a base such as dbu provides racemic or optically active trans -[ 3 -( 3 - azido - indan - 1 - yl )- indol - 1 - yl ]- phosphonic acid diphenyl esters of general formula xxii , respectively . n - protected trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxii are prepared by the treatment of trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxi with r 4 ═ h with an appropriate protection group reagent such as p - tolouensulfonic acid chloride as shown in scheme 8 . racemic or optically active trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxiii are prepared by the reduction of racemic or optically active trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxi or racemic or optically active n - protected trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxii under appropriate reducing conditions such as addition of sodium borohydride , in the presence of an appropriate transition metal catalyst such as pd / c under hydrogen or treatment with a trimethyl phosphine in pyridine and aqueous ammonium hydroxide as shown in scheme 9 , respectively . racemic or optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv with r 1 ═ h are prepared as shown in scheme 10 . racemic or optically active 3 -( 1h - indol - 3 - yl )- indan - 1 - ones of general formula xiv , xix or xx are treated with an amine ( nh 2 r 2 ) and a drying reagent such as tetraethoxy silane to give imines of formula xxiv , which are reduced using a reducing agent such as sodium borohydride or by treatment with hydrogen in the presence of transition metal catalyst such as pto 2 to give racemic or optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv with r 1 ═ h . racemic or optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv are prepared as shown in scheme 11 . a 3 -( 1h - indol - 3 - yl )- indan - 1 - one of general formula xiv , xix or xx are treated with an amine ( nhr 1 r 2 ) and a reducing reagent such as sodium cyanoborohydride in an acetic acid / methanol solution of appropriate ph to give racemic or optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv , respectively . treatment of racemic cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formulae xv or treatment of optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ols of general formulae xvii or xviii with an alcohol - activating reagent and a base such as triethyl amine followed reaction with an amine ( nhr 1 r 2 ) provides a mixture of racemic or optically active cis - and trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv , which are separated by standard chromatographic methods such as hplc or flash chromatography to give racemic or optically active cis - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv or racemic or optically active trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv as shown in scheme 12 . trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxvi with r 1 , r 4 ═ h are prepared by the treatment of n - protected trans - 3 -( 3 - azido - indan - 1 - yl )- 1h - indoles of general formula xxii with ( r 1 ) 2 bbr followed by removal of the indole protection group as shown in scheme 13 . trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxvi with r 1 , r 4 ═ h are prepared by the treatment of trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxiii with r 4 ═ h with methyl chloroformate followed by reduction with an appropriate reducing reagent such as lithium aluminum hydride as shown in scheme 14 . racemic cis - or trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv and xxvi are separated into their pairs of optically active cis - or trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines , respectively , by chromatographic techniques such as chiral supercritical fluid chromatography ( sfc ) and chiral hplc . racemic cis - or trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines of general formula xxv and xxvi are separated into their pairs of optically active cis - or trans - 3 -( 1h - indol - 3 - yl )- indan - 1 - ylamines , respectively , by fractional separation of diastomeric salts with an optically active acid and liberated the optically active amine compound by treatment with a base . lc - ms methods a and b , general : solvent system : a = water / tfa ( 100 : 0 . 05 ) and b = water / acetonitrile / tfa ( 5 : 95 : 0 . 035 ) ( tfa = trifluoroacetic acid ). purity was determined by integration of the uv ( 254 nm ) and elsd trace and retention times ( rt ) are expressed in minutes . ms instruments are from pesciex ( api ), equipped with appi - source and operated in positive ion mode . method a : api 150ex and shimadzu lc8 / slc - 10a lc system . column : 30 × 4 . 6 mm waters symmetry c18 with 3 . 5 μm particles operated at room temperature . linear gradient elution with 90 % a to 100 % b in 4 min and a flow rate of 2 ml / min . method b : api 150ex and shimadzu lc8 / slc - 10a lc system . column : 30 × 4 . 6 mm waters symmetry c18 with 3 . 5 μm particles operated at 40 ° c . linear gradient elution with 90 % a to 100 % b in 2 . 4 min and a flow rate of 3 . 3 ml / min . lc - ms tof ( tof = time of flight ) method c : micromass lct 4 - ways mux equipped with a waters 2488 / sedex 754 detector system . column : 30 × 4 . 6 mm waters symmetry c18 column with 3 . 5 μm particle size operated at room temperature . linear gradient elution with 90 % a to 100 % b in 4 min and a flow rate of 2 ml / min . purity was determined by integration of the uv ( 254 nm ) and elsd trace and retention times ( rt ) are expressed in minutes . 1 h nmr and 13 c nmr spectra were recorded on a bruker drx 500 at 500 . 13 mhz and 125 . 67 , respectively . deuterated chloroform ( 99 . 8 % d ) or dimethylsulfoxide ( 99 . 9 % d ) were used as solvents . tms was used as internal reference standard . chemical shifts are expressed as ppm values . the following abbreviations are used for multiplicity of nmr signals : s = singlet , d = doublet , t = triplet , q = quartet , qv = quintet , h = heptet , dd = double doublet , dt = double triplet , dq = double quartet , tt = triplet of triplets , m = multiplet , b = broad . 390 g ( 2 . 2 mol ) n - bromosuccinimde ( powder with no lumps ) and 0 . 5 g benzoyl peroxide were added to 264 g indan - 1 - one in 1500 ml ccl 4 and refluxed with mechanical stirring for 1 . 5 hours . the colour of the reaction mixture suddenly changed to yellow and all n - bromosuccinimde ( heavier than ccl 4 ) was converted to succinimide ( lighter than ccl4 ). the reaction mixture was cooled to 20 ° c ., filtered and concentrated in vacuo . crude 3 - bromo - indan - 1 - one was dissolved in 600 ml ethyl acetate / heptane ( 1 : 2 ), cooled 2 hours on an ice bath and then left in a freezer over night to give 257 g crystals of 3 - bromo - indan - 1 - one ( 62 % yield ). triethylamine ( 4 . 5 ml ; 32 mmol ; 1 . 2 equiv .) was added to 3 - bromo - indan - 1 - one ( 5 . 6 g ; 27 mmol ) in 100 ml thf at 0 ° c . and stirred 1 h at r . t . the reaction mixture was filtered to remove triethylammonium bromide and concentrated in vacuo to give inden - 1 - one . 7 - fluoroindole ( 3 . 3 g , 22 mmol ) and sc ( otf ) 3 ( 550mg , 5 mol %) were added to inden - 1 - one in 100 ml ch 2 cl 2 at 0 ° c . the reaction mixture was allowed to warm to room temperature over night . 100 ml ethyl acetate was added and the mixture was filtered through a silica gel plug and concentrated in vacuo . after flash chromatography ( heptane / ethyl acetate , silica gel ) 5 . 9 g 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - one ( 82 %) was isolated . 3 -( 1h - indol - 3 - yl )- indan - 1 - one 3 -( 1 - methyl - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 5 - fluoro - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 6 - fluoro - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 6 - methoxy - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 5 - fluoro - 2 - methyl - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 4 - chloro - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 7 - chloro - 1h - indol - 3 - yl )- indan - 1 - one 5 - fluoro - 3 -( 7 - methyl - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 6 - bromo - 1h - indol - 3 - yl )- 5 - fluoro - indan - 1 - one 3 -( 4 - chloro - 1h - indol - 3 - yl )- 6 - fluoro - indan - 1 - one 3 -( 4 , 6 - difluoro - 1h - indol - 3 - yl )- 6 - fluoro - indan - 1 - one 3 -( 4 - chloro - 1h - indol - 3 - yl )- 6 - methoxy - indan - 1 - one 3 -( 5 , 6 - difluoro - 1h - indol - 3 - yl )- 6 - methoxy - indan - 1 - one 5 - chloro - 3 -( 5 - fluoro - 1h - indol - 3 - yl )- indan - 1 - one 3 -( 6 - chloro - 3 - oxo - indan - 1 - yl )- 1h - indole - 5 - carbonitrile 6 - chloro - 3 -( 5 - methoxy - 1h - indol - 3 - yl )- indan - 1 - one 6 - chloro - 3 -( 7 - methoxy - 1h - indol - 3 - yl )- indan - 1 - one nabh 4 ( 6 . 2 g , 163 mmol , 2 equiv .) was added to 3 -( 1h - indol - 3 - yl )- indan - 1 - one ( 20 g , 80 . 9 mmol ) in 200 ml methanol and 100 ml thf at 0 ° c . the reaction mixture was allowed to warm to room temperature over night . aqueous work up gave racemic cis - 3 - indolyl - indan - 1 - ol ( quantitative ). novozym 435 ( 1g ) ( available from novozymes a / s , krogshoejvej 36 , 2880 bagsvaerd , denmark ) and vinyl butyrate ( 20 . 5 ml , 162 mmol ) were added to racemic cis - 3 - indolyl - indan - 1 - ol ( 80 . 9 mmol ) in 200 ml toluene . the reaction mixture was shaken for 2 days under argon until 1 h - nmr shows 50 % conversion . the reaction mixture was filtered and concentrated in vacuo . after flash chromatography ( heptane / ethyl acetate , silica gel ) 13 . 49 g butyric acid ( 1r , 3s )- 3 -( 1h - indol - 3 - yl )- indan - 1 - yl ester and 9 . 78 g ( 1s , 3r )- 3 -( 1h - indol - 3 - yl )- indan - 1 - ol were isolated . 3 ml 30 % naome in methanol was added to 13 . 49 g butyric acid ( 1r , 3s )- 3 -( 1h - indol - 3 - yl )- indan - 1 - yl ester in 100 ml methanol . tlc showed full conversion after 1 . 5 hours . 1 . 5 g solid nh 4 cl and 50 ml water were added . methanol was removed in vacuo and after aqueous work up , ( 1r , 3s )- 3 -( 1h - indol - 3 - yl )- indan - 1 - ol ( 37 . 9 mmol ) was obtained . dess - martin periodane ( 1 . 08 g , 2 . 55 mmol ) in 10 ml ch 2 cl 2 was added to ( 1s , 3r )- 3 -( 1h - indol - 3 - yl )- indan - 1 - ol ( 2 . 52 mmol ) in 10 ml ch 2 cl 2 at 0 ° c . the reaction mixture was allowed to warm to room temperature and stirred 40 min — tlc showed full conversion . to the reaction mixture ethyl acetate and sat . nahco 3 was added . the organic phase was isolated , washed with 2n naoh and brine , dried over mgso 4 and concentrated in vacuo . a quantitative yield of ( r )- 3 -( 1h - indol - 3 - yl )- indan - 1 - one was obtained after flash chromatography ( heptane / ethyl acetate , silica gel ). 1 , 8 - diazabicyclo [ 5 . 4 . 0 ] undec - 7 - ene ( 4 . 8 ml , 32 . 1 mmol , 1 . 45 equiv ) was added to ( 1r , 3s )- 3 -( 1h - indol - 3 - yl )- indan - 1 - ol ( 22 . 2 mmol ) and diphenyl phosphoryl azide ( 6 . 0 ml , 27 . 8 mmol , 1 . 25 equiv ) in 150 ml dry thf at 0 ° c . the reaction was stirred 0 . 5 hours at 0 ° c ., then 2 hours at room temperature — tlc showed full conversion . the reaction mixture was poured into water and extracted with ethyl acetate . the organic phase was washed with 100 ml 0 . 5 n hcl , sat . nahco 3 , dried over mgso 4 and concentrated in vacuo to give the 3 -(( 1s , 3s )- 3 - azido - indan - 1 - yl )- 1h - indole . diphenyl phosphoryl azide ( 23 g , 85 mmol ) was added to ( 1s , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - ol ( 10 g , 35 mmol ) in 150 ml dry thf at 5 ° c . 1 , 8 - diazabicyclo [ 5 . 4 . 0 ] undec - 7 - ene ( 13 . 7 ml , 92 mmol ) was added over 0 . 5 hours . the reaction mixture was stirred over night while warming to room temperature . the reaction mixture was poured into brine and extracted with et 2 o . the organic phase was washed with 100 ml 0 . 1 n hcl , 0 . 1 n naoh , dried over mgso 4 and concentrated in vacuo . after flash chromatography . ( heptane / ethyl acetate , silica gel ), 19 . 1 g [ 3 -(( 1r , 3r )- 3 - azido - indan - 1 - yl )- 5 - chloro - indol - 1 - yl ]- phosphonic acid diphenyl ester was isolated . 1 g sodium hydride ( 60 % in mineral oil ) was added to 2 g 3 -(( 1r , 3r )- 3 - azido - indan - 1 - yl )- 6 - methoxy - 1h - indole in 50 ml dry thf at 5 ° c . and the reaction mixture was stirred 1 hour at 5 ° c . 2 g p - toluene sulfonic acid chloride was added in portions at 5 ° c . and stirring was continued for another 4 hours . ice was added and after 1 hour water and ethyl acetate was added . the organic phase was separated and washed with brine , dried over mgso 4 and concentrated in vacuo . after flash chromatography ( heptane / ethyl acetate , silica gel ), 2 . 5 g 3 -(( 1r , 3r )- 3 - azido - indan - 1 - yl )- 6 - methoxy - 1 -( toluene - 4 - sulfonyl )- 1h - indole was isolated . 32 g trimethyl phosphine was added over 2 hours to 19 g [ 3 -(( 1r , 3r )- 3 - azido - indan - 1 - yl )- 5 - chloro - indol - 1 - yl ]- phosphonic acid diphenyl ester in 100 ml pyridine and 36 ml 9n ammonium hydroxide at room temperature . the reaction mixture was stirred over night at room temperature and concentrated in vacuo . ethyl acetate and water were added . the mixture was made basic with aqueous naoh and filtered . the organic phase was concentrated in vacuo and was dissolved in ethyl acetate again . the ethyl acetate solution was extracted with 2 × 250 ml 2n methanesulfonic acid . the aqueous phase was made basic with 9n naoh to form a precipitate , which was subjected to flash chromatography ( ethyl acetate , methanol , triethylamine , silica gel ) to give 0 . 6 g ( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - ylamine . the ethyl acetate phase from above was concentrated in vacuo and was dissolved in 100 ml methanol and 10 ml 30 % naome in methanol was added . the reaction mixture was stirred 2 hours at room temperature , concentrated in vacuo and purified by flash chromatography ( ethyl acetate , methanol , triethylamine , silica gel ) to give further 0 . 45 g ( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - ylamine . ( r )- 3 -( 1h - indol - 3 - yl )- indan - 1 - one , methyl amine ( 5 ml 2m in thf ) and 1 ml tetraethoxy silane in 10 ml methanol were stirred 11 minutes at 150 ° c . under microwave irradiation using the emry optimizer ™ instrument . pto 2 ( 10 mg ) was added and the reaction mixture was stirred under 1 atm . hydrogen over night at room temperature , filtered and concentrated in vacuo . [( 1s , 3r )- 3 -( 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine was isolated in 66 % yield after flash chromatography ( ethyl acetate , methanol , triethylamine , silica gel ). preparative scale chiral sfc purification ( method 15 ): method : column : chiralcel oj - h ( 2 × 25 cm ) operated at room temperature . chromatography was carried out using 35 % of methanol with 0 . 1 % ( v / v ) diethylamine as modifier in co2 ( 100 bar ) and a flow rate 50 ml / min . analytical chiral sfc : method : column : 250 × 4 . 6 mm chiralcel ad - h with 5 μm particles operated at room temperature . chromatography was carried out using 40 % of ethanol with 0 . 1 % ( v / v ) diethylamine as modifier in co2 ( 100 bar ) and a flow rate 3 ml / min . detection at 220 nm . rt major = 2 . 52 min , rt minor = 3 . 29 min , & gt ; 99 . 5 % ee . 1 h - nmr ( hydrobromide salt ; d 6 - dmso ): δ 2 . 23 - 2 . 27 ( m , 1h ), 2 . 71 ( s , 3h ), 2 . 93 - 2 . 95 ( m , 1h ), 4 . 62 ( dd , j = 7 . 8 hz , 10 . 2 hz , 1h ), 4 . 88 ( t , j = 8 . 3 hz , 1h ), 6 . 87 - 6 . 96 ( m , 3h ), 7 . 12 ( d , j = 7 . 7 hz , 1h ), 7 . 30 ( t , j = 14 . 8 hz , 1h ), 7 . 35 - 7 . 38 ( m , 2h ), 7 . 72 ( d , j = 7 . 6 hz , 1h ), 11 . 5 ( bs , 1h ). preparative scale chiral sfc purification ( method 15 ): method : column : chiralcel oj - h ( 2 × 25 cm ) operated at room temperature . chromatography was carried out using 35 % of methanol with 0 . 1 % ( v / v ) diethylamine as modifier in co2 ( 100 bar ) and a flow rate 50 ml / min . analytical chiral sfc : method : column : 250 × 4 . 6 mm chiralcel ad - h with 5 μm particles operated at room temperature . chromatography was carried out using 40 % of ethanol with 0 . 1 % ( v / v ) diethylamine as modifier in co2 ( 100 bar ) and a flow rate 3 ml / min . detection at 220 nm . rt major = 3 . 36 min , rt minor = 2 . 46 min , & gt ; 99 . 5 % ee . 1 h - nmr ( d 6 - dmso ): δ 1 . 89 - 1 . 96 ( m , 1h ), 2 . 15 ( bs , 1h ), 2 . 40 ( s , 3h ), 2 . 75 - 2 . 80 ( m , 1h ), 4 . 17 ( dd , j = 7 . 3 hz , 8 . 7 hz , 1h ), 4 . 44 ( dd , j = 7 . 5 hz , 10 . 4 hz , 1h ), 6 . 82 - 6 . 90 ( m , 3h ), 7 . 07 - 7 . 11 ( m , 2h ), 7 . 20 ( t , j = 7 . 4 hz , 1h ), 7 . 26 ( d , j = 2 . 2 hz , 1h ), 7 . 42 ( d , j = 7 . 5 hz , 1h ), 11 . 4 ( bs , 1h ). 13 c - nmr ( d 6 - dmso ): δ 33 . 7 , 39 . 4 , 63 . 3 , 106 . 1 ( j cf = 16 hz ), 115 . 7 , 118 . 5 , 118 . 8 , 124 . 0 , 124 . 1 , 124 . 3 , 124 . 8 , 124 . 9 , 126 . 6 , 127 . 2 , 130 . 8 , 145 . 7 , 146 . 2 , 149 . 7 ( j cf = 243 hz ). sodium cyanoborohydride ( 61 mg ; 0 . 97 mmol ) was added to 3 -( 1h - indol - 3 - yl )- indan - 1 - one ( 200 mg ; 0 . 81 mmol ) and piperidine ( 344 mg ; 4 . 05 mmol ) in 3 ml methanol and 0 . 5 ml acetic acid . the reaction mixture was stirred 30 minutes at 150 ° c . under microwave irradiation using the emry optimizer ™ instrument . the reaction mixture was poured into water and made basic with 27 % aqueous naoh . the mixture was extracted with ethyl acetate . the organic phase was dried over mgso 4 and concentrated in vacuo . cis - 3 -( 3 - piperidin - 1 - yl - indan - 1 - yl )- 1h - indole was obtained after flash chromatography ( ethyl acetate , heptane , triethylamine , silica gel ). dimethylbromoborane ( 1 . 77 ml , 1 . 05 equiv ) ( synthesized according to nöth , h ., vahrenkamp , h . journal of organometallic chemistry 11 ( 1968 ), 399 - 405 ) was added to 3 -(( 1r , 3r )- 3 - azido - indan - 1 - yl )- 1 -( toluene - 4 - sulfonyl )- 1h - indole ( 17 . 3 mmol ) in 100 ml 1 , 2 - dichloro - ethane under argon at 0 ° c . the reaction mixture was warmed to room temperature and stirred 2 . 5 hours . 1 ml ethanol was added . the reaction mixture was extracted with ethyl acetate and 0 . 5n aqueous naoh . the organic phase was washed with brine , dried over mgso 4 , concentrated in vacuo to give methyl -{( 1r , 3r )- 3 -[ 1 -( toluene - 4 - sulfonyl )- 1h - indol - 3 - yl ]- indan - 1 - yl }- amine after flash chromatography ( ethyl acetate , methanol , triethylamine , silica gel ). methyl -{( 1r , 3r )- 3 -[ 1 -( toluene - 4 - sulfonyl )- 1h - indol - 3 - yl ]- indan - 1 - yl }- amine was dissolved in 8 ml acetone and 20 ml methanol . 8 ml 28 % aqueous naoh was added and the reaction mixture was stirred in two portions at 120 ° c . for 10 minutes under microwave irradiation using the emry optimizer ™ instrument . the reaction mixture was poured into 250 ml water and a precipitate was formed . recrystallization gave 2 . 15 g [( 1r , 3r )- 3 -( 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine . chiral sfc : method : column : 250 × 4 . 6 mm chiralcel oj - h with 5 μm particles operated at room temperature . chromatography was carried out using 30 % of 0 . 1 % ( v / v ) diethylamin in ethanol as modifier , a pressure of 20 mpa and a flow rate 3 ml / min . detection at 230 nm . rt major = 2 . 40 min , rt minor = 2 . 93 min , 95 . 9 % ee . lc / ms : method a : rt = 1 . 63 min . uv - purity = 98 . 28 %, elsd purity = 99 . 61 % 1 h - nmr ( d 6 - dmso ): δ 2 . 35 ( m , 5h ), 4 . 17 ( dd , j = 3 . 8 hz , 6 . 6 hz , 1h ), 4 . 75 ( t , j = 7 . 5 hz , 1h ), 6 . 90 ( t , j = 7 . 1 hz , 1h ), 7 . 00 ( m , 3h ), 7 . 14 ( t , j = 7 . 3 hz , 1h ), 7 . 19 ( t , j = 7 . 3 hz , 1h ), 7 . 26 ( d , j = 8 . 0 hz , 1h ) 7 . 34 ( d , j = 7 . 3 hz , 1h ), 7 . 38 ( d , j = 7 . 3 hz , 1h ), 10 . 80 ( bs , 1h ). 13 c - nmr ( d 6 - dmso ): δ 34 . 2 , 39 . 9 , 41 . 3 , 63 . 6 , 111 . 9 , 118 . 0 , 118 . 5 , 119 . 1 , 121 . 3 , 122 . 4 , 124 . 8 , 125 . 0 , 126 . 4 , 126 . 7 , 127 . 6 , 137 . 1 , 145 . 3 , 147 . 2 . lc / ms : method a : rt = 1 . 60 min . uv - purity = 98 . 52 %, elsd purity 99 . 53 % 1 h - nmr ( cdcl 3 ): δ 2 . 41 ( ddd , j = 3 . 8 hz , 7 . 5 hz , 12 . 8 hz , 1h ), 2 . 50 ( t , j = 6 . 8 hz , 1h ), 2 . 53 ( s , 3h ), 3 . 83 ( s , 3h ), 4 . 27 ( dd , j = 3 . 8 hz , 6 . 8 hz , 1h ), 4 . 79 ( t , j = 7 . 5 hz , 1h ), 6 . 72 ( m , 2h ), 6 . 85 ( s , 1h ), 7 . 2 ( m , 4h ), 7 . 40 ( d , j = 7 . 3hz , 1h ), 7 . 82 ( bs , 1h ). 0 . 15 mmol dimethylbromoborane ( synthesized according to nöth , h ., vahrenkamp , h . journal of organometallic chemistry 11 ( 1968 ), 399 - 405 ) in 0 . 5 ml dry 1 , 2 - dichloroethane was added to approximately 0 . 1 mmol [ 3 -( 3 - azido - 6 - chloro - indan - 1 - yl )- indol - 1 - yl ]- phosphonic acid diphenyl ester in 2 ml dry 1 , 2 - dichloroethane . the reaction mixture was stirred 3 hours at room temperature . the reaction was quenched by the addition of 1 ml 1 n naoh and 1 ml brine . the mixture was extracted with ethyl acetate . the organic phase was concentrated in vacuo . the residue was treated with 3 ml 1m sodium methoxide in methanol for 3 h ar room temperature . 1 ml acetic acid was added and [ 6 - chloro - 3 -( 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine was isolated after preparative hplc . 0 . 73 g ( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - ylamine was suspended in 200 ml 1 , 2 - dichloro - ethane , 100 ml water and 0 . 5 ml 9n naoh . 0 . 25 ml methyl chloroformate ( 1 . 2 equiv ) and 50 mg bu 4 nbr were added . the reaction mixture was stirred 30 minutes at room temperature . the organic phase was dried over mgso 4 and concentrated in vacuo to give 0 . 6 g [( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - yl ]- carbamic acid methyl ester . 0 . 6 g [( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - yl ]- carbamic acid methyl ester was obtained after aqueous work up . [( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - yl ]- carbamic acid methyl ester was dissolved in 250 ml dry thf and 0 . 6 g lialh 4 was added . the reaction mixture was refluxed for 2 hours . the reaction was quenched with 2 ml water , filtered and concentrated in vacuo to give an oil . the oil was dissolved in ethyl acetate and 350 mg [( 1r , 3r )- 3 -( 5 - chloro - 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine precipitated on standing at room temperature over night . chiral sfc : method : column : 250 × 4 . 6 mm chiralcel ad - h with 5 μm particles operated at room temperature . chromatography was carried out using 30 % of 0 . 1 % ( v / v ) diethylamin in ethanol as modifier , a pressure of 20 mpa and a flow rate 3 ml / min . detection at 230 nm . rt major = 2 . 89 min , rt minor = 3 . 84 min , 88 . 6 % ee . lc / ms : method c : rt = 1 . 54 min . uv - purity = 95 . 21 %, elsd purity = 100 % 13 h - nmr ( cdcl 3 ): δ 2 . 38 - 2 . 52 ( m , 2h ), 2 . 53 ( s , 3h ), 4 . 27 ( dd , j = 3 . 9 hz , 6 . 6 hz ), 4 . 77 ( t , j = 7 . 4 ), 6 . 82 ( s , 1h ), 7 . 12 ( dd , j = 2 . 0 hz , 8 . 5 hz , 1h ), 7 . 20 - 7 . 27 ( m , 3h ) 7 . 37 ( d , j = 2 . 0 hz ), 7 . 42 ( d , j = 7 . 4 hz ), 8 . 16 ( bs , 1h ). 20 g of racemic cis - 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - yl - methyl - amine ( from method 10 ) was purified by chiral sfc to give 9 . 3 g of [( 1s , 3r )- 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine with & gt ; 99 . 5 % ee and 9 . 5 g of [( 1r , 3s )- 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine with & gt ; 99 . 5 % ee . preparative scale chiral sfc purification method : column : chiralcel oj - h ( 2 × 25 cm ) with 5 μm particles operated at 35 ° c . chromatography was carried out using 35 % of methanol with 0 . 1 % ( v / v ) diethylamine as modifier in co2 ( 100 bar ) and a flow rate 50 ml / min . fractional crystallization of racemic cis - 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - yl - methyl - amine with an optically active acid ( method 16 ) to a solution of the racemate cis - 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - yl - methyl - amine ( 409 mg / 2ml etoh ) was added a solution of di - p - toluoyl - d - tartaric acid ( 1 eq ; 564 mg / 2 ml acetone ). the mixture was heated to 50 ° c . and stirred for 15min . evaporated the solvent and triturated with acetone ( 2 ml ). the white solid ( 84 % ee ) was collected and stirred with 10 ml hot etoh for 30 min . the remaining white solid was collected and converted to free base to give [( 1s , 3r )- 3 -( 7 - fluoro - 1h - indol - 3 - yl )- indan - 1 - yl ]- methyl - amine ( 93 % ee ). measured molecular mass ( m + h + ), measured hplc - retention time ( r t , whole brains from male wistar rats ( 125 - 225 g ), excluding cerebellum , are homogenized in 0 . 40 m sucrose supplemented with 1 mm nialamid with a glass / teflon homogenizer . the homogenate is centrifuged at 1000 × g for 10 min at 4 ° c . the pellet is discarded and the supernatant is centrifuged at 40 . 000 × g for 20 min . the final pellet is homogenized in assay buffer ( 0 . 5 mg original tissue / well ). test compounds ( or buffer ) and 10 nm [ 3 h ]- 5 - ht are added to 96 well plates . composition of assay buffer : 123 mm nacl , 4 . 82 mm kcl , 0 . 973 mm cacl 2 , 1 . 12 mm mgso 4 , 12 . 66 mm na 2 hpo 4 , 2 . 97 mm nah 2 po 4 , 0 . 162 mm edta , 2 g / l glucose and 0 , 2 g / l ascorbic acid . buffer is oxygenated with 95 % 0 2 / 5 % co 2 for 10 min . the incubation is started by adding tissue to a final assay volume of 0 . 2 ml . after 15 min incubation with radioligand at 37 ° c ., samples are filtered directly on unifilter gf / c glass fiber filters ( soaked for 30 min in 0 . 1 % polyethylenimine ) under vacuum and immediately washed with 1 × 0 . 2 ml assay buffer . non - specific uptake is determined using citalopram ( 10 μm final concentration ). citalopram is included as reference in all experiments as dose - response curve . fresh occipital -, temporal - og parietal cortex from male wistar rats ( 125 - 225 g ) are homogenized in 0 . 4m sucrose with a glass / teflon homogenizer . the homogenate is centrifuged at 1000 × g for 10 min at 4 ° c . the pellet is discarded and the supernatant is centrifuged at 40 . 000 × g for 20 min . the final pellet is homogenized in this assay buffer : 123 mm nacl , 4 . 82 mm kcl , 0 . 973 mm cacl 2 , 1 . 12 mm mgso 4 , 12 . 66 mm na 2 hpo 4 , 2 . 97 mm nah 2 po 4 , 0 . 162 mm edta , 2 g / l glucose and 0 . 2 g / l ascorbic acid ( 7 . 2 mg original tissue / ml = 1 mg / 140 μl ). buffer is oxygenated with 95 % 0 2 / 5 % co 2 for 10 min . pellet is suspended in 140 volumes of assaybuffer . tissue is mixed with test compounds and after 10 min pre - incubation , 10 nm [ 3 h ]- noradrenaline is added to a final volume of 0 . 2 ml and the mixture is incubated for 15 min at 37 ° c . after 15 min incubation , samples are filtered directly on unifilter gf / c glass fiber filters ( soaked for 30 min in 0 . 1 % polyethylenimine ) under vacuum and immediately washed with 1 × 0 . 2 ml assay buffer . non - specific uptake is determined using talsupram ( 10 μm final concentration ). duloxetine is included as reference in all experiments as dose - response curve . tissue preparation : male wistar rats ( 125 - 250 g ) are sacrificed by decapitation and striatum quickly dissected out and placed in ice cold 0 . 40 m sucrose . the tissue is gently homogenised ( glass teflon homogeniser ) and the p2 fraction is obtained by centrifugation ( 1000 g , 10 minutes and 40000 g , 20 minutes , 4 ° c .) and suspended in 560 volumes of a modified krebs - ringer - phosphate buffer , ph 7 . 4 . tissue 0 , 25 mg / well ( 140 μl ) ( original tissue ) is mixed with test suspension . after 5 minutes pre - incubation at room temperature , 12 . 5 nm 3h - dopamine is added and the mixture is incubated for 5 minutes at room temperature . final volume is 0 . 2 ml . the incubation is terminated by filtering the samples under vacuum through whatman gf / c filters with a wash of 1 × 0 . 2ml buffer . the filters are dried and appropriate scintillation fluid ( optiphase supermix ) is added . after storage for 2 hours in the dark the content of radioactivity is determined by liquid scintillation counting . uptake is obtained by subtracting the non - specific binding and passive transport measured in the presence of 100 μm of benztropin . for determination of the inhibition of uptake ten concentrations of drugs covering 6 decades are used . 3 h - da = 3 , 4 -( ring - 2 , 5 , 6 - 3 h ) dopamine hydrochloride from new england nuclear , specific activity 30 - 50 ci / mmol . the following references are incorporated herein by reference in their entirety : hyttel & amp ; larsen , acta pharmacol . tox . 1985 , 56 , suppl . 1 , 146 - 153 . as shown in table 1 , activity ( ic 50 ) at the monoamine transporter for the compounds in the present invention was determined to be within the range of 0 . 1 - 200 nm .