( ( Compounds ( wherein ( ( ( ( the group ) and ) ( the piperidine ) ) ring ) ) ) ( ( are ( each ( bonded ( ( directly ( to ( ( the ( same chalcogen ) ) ( -LRB- ( ( ( i.e. , ) ( oxygen ( , ( sulfur ( , ( selenium ( , ( or tellurium ) ) ) ) ) ) ) ) -RRB- ) ) ) ) ) atom ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Compounds)) (SBAR (WHADVP (WRB wherein)) (S (NP (NP (DT the) (NN group)) (CC and) (NP (DT the) (NN piperidine))) (VP (VBP ring))))) (VP (VBP are) (NP (DT each) (VBN bonded) (ADJP (RB directly) (PP (TO to) (NP (NP (DT the) (JJ same) (NN chalcogen)) (PRN (-LRB- -LRB-) (NP (NP (NNP i.e.)) (, ,) (NP (NN oxygen) (, ,) (NN sulfur) (, ,) (NN selenium) (, ,) (CC or) (NN tellurium))) (-RRB- -RRB-))))) (NN atom))) (. .)))
Compounds wherein the group and the piperidine ring are each bonded directly to the same chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) atom.
(ROOT (S (NP (DT An) (NN ether)) (VP (VBZ is) (NP (NP (DT an) (JJ organic) (NN compound)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (NN hydrocarbon) (NNS groups)) (VP (VBP are) (VP (VBG bonded) (PP (TO to) (NP (DT the) (JJ same) (NN oxygen) (NN atom))))))))) (. .)))