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The title compound(9S,13R,14S)-7,8-dehydro-4-(4'-bromo-benzyloxy)-3,7-dime-thoxy-17-methyl-morphinan-6-one monohydrate(O-4-bromobenzylsinomenine) was synthesized by the reaction of(9S,13R,14S)-7,8-dehydro-4-hydroxy-3,7-dimethoxy-17-methyl-morphinan-6-