The title compound(7R,8S,9S,12S)-13,14-dehydro-1-(4'-fluorobenzyloxy)-N-methyl-2,13-dimethoxy-12-hydroxymorphinane was synthesized by the reaction of O-4-bromobenzylsinomenine with lithium aluminum hydride.Its chemical structure was determined by X-ray single-crystal diffraction.The crystal belongs to triclinic,space group P1 with Mr=439.51,a= 7.7236(1),b=8.7282(1),c=9.9342(2)A,α=81.176(1),β=67.43,γ=64.577(1)°,μ=0.76 mm-1,V=558.4...