(5alpha,6alpha)-4,5-Epoxy-3-methoxy-17-methylmorphinan-6-ol hydrochloride 36418-29-8 Dihydrocodeine methyl ether hydrochloride EINECS 253-026-1 Morphinan-6-alpha-ol, 4,5-alpha-epoxy-3-methoxy-17-methyl-, hydrochloride