(20S)-3β-acetoxy-16-methoxy-16α,30-epoxy-24,25,26,27-tetranor-5α-dammarane-23,20-carbolactone                                                                                                                                                              在
                                                                                                                                                                                 
苯基溴化镁                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚   、                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以0.12 g的产率得到(S)-4-((1S,2R,4aS,4bR,6aR,8S,10aR,10bR,12aR)-8-hydroxy-2-methoxy-4b,7,7,10a-tetramethyltetradecahydro-2H,4H-2,4a-methanonaphtho[1,2-h]isochromen-1-yl)-1,1-diphenylpentane-1,4-diol