Synonyms: (5α)-7,8-didehydro-4,5-epoxy-3-hydroxy-17-methylmorphinan-6-one;BRN 0042464;Didehydro-4,5-alpha-epoxy-3-hydroxy-17-methylmorphinan-6-one;(5alpha)-7,8-Didehydro-4,5-epoxy-3-hydroxy-17-methylmorphinan-6-one;Morphinan-6-one, 7,8-didehydro-4,5-epoxy-3-hydroxy-17-methyl-, (5-alpha)-;(5alpha)-3-hydroxy-17-methyl-7,8-didehydro-4,5-epoxymorphinan-6-one;(5α,6α)-3,6-dihydroxy-17-methyl-7,8-didehydro-4,5-epoxymorphinan-10-one