(5R,6S,9R,13S,14R)-4,5-Epoxy-3,6-dimethoxy-9alpha-methylmorphinan (5alpha,6beta)-4,5-Epoxy-3,6-dimethoxy-17-methylmorphinan 4,5alpha-Epoxy-3,6-dimethoxy-17-methylmorphinan 41714-53-8 EINECS 255-511-3 Morphinan, 4,5-alpha-epoxy-3,6-dimethoxy-17-methyl- Tetrahydrothebaine