quaternary derivatives of naloxone and naltrexone , methyl naloxonium chloride ( org 10908 ) and naltrexone methobromide ( mrz 2663br ) , respectively , were compared with the parent compounds for their ability to antagonize the reinforcing properties of heroin as measured in an operant , i.v. , self-administration paradigm .
C0027358
naloxone
C0027360
naltrexone