Synonyms: Nalmexone [INN];4,5alpha-Epoxy-3,14-dihydroxy-N-(3-methyl-2-butenyl)-6-morphinanon;7,7a,8,9-Tetrahydro-3,7a-dihydroxy-12-(3-methyl-2-butenyl)-6H-8,9c-iminoethanophenantro(4,5-bcd)furan-5(4alphaH)-on;7,8-Dihydro-14-hydroxy-N-(3-methyl-2-butenyl)normorphinone;Nalmessone;Nalmessone [DCIT];Nalmexona;Nalmexona [INN-Spanish];Nalmexonum;Nalmexonum [INN-Latin];UM 592;UNII-AIB278UKIG;4,5-Epoxy-3,14-dihydroxy-17-(3-methyl-2-butenyl)morphinan-6-one;Morphinan-6-one, 4,5-epoxy-3,14-dihydroxy-17-(3-methyl-2-butenyl)-. (5alpha)-;(5alpha)-3,14-dihydroxy-17-(3-methylbut-2-en-1-yl)-4,5-epoxymorphinan-6-one