methyl (3β,5β,7α,12α)-7-chloromethoxy-12-hydroxy-3-{2-[{4-[(11β,17α)-17-hydroxy-3-oxo-17-prop-1-ynylestra-4,9-dien-11-yl]phenyl}(methyl)amino]ethoxy}cholan-24-oate   、                                                                                      
Boc-5-氨基戊酸                                                                                                                                                              在
                                                                                                                                                                                 CsCO
3                                                                                                                                  作用下,
                                                                                                                以
                                                                                         DMF (N,N-dimethyl-formamide)                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
methyl (3β,5β,7α,12α)-7-(5-tert-butoxycarbonylaminopentanoyloxy)-12-hydroxy-3-{2-[{4-[(11β,17α)-17-hydroxy-3-oxo-17-prop-1-ynylestra-4,9-dien-11-yl]phenyl}(methyl)amino]ethoxy}cholan-24-oate