methyl (1R,2R,5R,8R,9S,10R,11S,12R)-12-hydroxy-11-methyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadecane-9-carboxylate   、                                                                                      
甲基磺酰氯                                                                                                                                                                                                                                                                                                          生成                                                 
methyl (1R,2R,5R,8R,9S,10R,11S,12R)-11-methyl-6-methylidene-12-methylsulfonyloxy-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadecane-9-carboxylate