Morphinan-3,6-diol, 7,8-didehydro-4,5-epoxy-17-methyl- (5alpha,6alpha)-, (5alpha,6alpha)-, di-3-pyridinecarboxylate (ester), hydrochloride, mixt. with (5alpha,6alpha)-7,8-didehydro-4,5-epoxy-17-(2-propenyl)morphinan-3,6-diol di-3-pyridinecarboxylate (ester), monohydrochloride