Synonyms: Dihydrothebaine;(5R,9R,13S,14R)-4,5-Epoxy-3,6-dimethoxy-N-methyl-6-morphinen;(5R,9R,13S,14R)-4,5-Epoxy-3,6-dimethoxy-N-methyl-6-morphinen [IUPAC];4,5alpha-Epoxy-3,6-dimethoxy-17-methyl-6-morphinen;8,14-Dihydrothebaine;delta(sup 6)-Dihydrothebaine;(5alpha)-6,7-Didehydro-4,5-epoxy-3,6-dimethoxy-17-methylmorphinan;Morphinan, 6,7-didehydro-4,5-alpha-epoxy-3,6-dimethoxy-17-methyl- (8CI);Morphinan, 6,7-didehydro-4,5-epoxy-3,6-dimethoxy-17-methyl- (5-alpha,14-xi)- (9CI);Thebaine, dihydro-;(5alpha)-3,6-dimethoxy-17-methyl-6,7-didehydro-4,5-epoxymorphinan