(5alpha,8alpha)-6,7-Didehydro-4,5-epoxy-3-methoxy-17-methylmorphinan-8-ol 509-55-7 Allopseudocodeine EINECS 208-099-4 Morphinan-8-alpha-ol, 6,7-didehydro-4,5-alpha-epoxy-3-methoxy-17-methyl-