Synonyms: 2-Butenoicacid, 4-[[(5a,6b)-17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxymorphinan-6-yl]amino]-4-oxo-,methyl ester, monohydrochloride, (2E)- (9CI); 2-Butenoic acid, 4-[[(5a,6b)-17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxymorphinan-6-yl]amino]-4-oxo-,methyl ester, monohydrochloride, (E)-; Morphinan, 2-butenoic acid deriv.;Naltrexone b-fumarate methyl esterhydrochloride; b-Funaltrexaminehydrochloride