(5alpha)-4,6-Epoxy-3,14-dihydroxy-17-(2-methoxyethyl)morphinan-6-one 148708-26-3 4,5 alpha-Epoxy-3,14-dihydroxy-17-(2-methoxyethyl)morphinan-6-one 88939-40-6 Mr 2264 N-(2-Methoxyethyl)noroxymorphone Semorphone Semorphone [INN]