(R)-4-[(3S,5R,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-Dihydroxy-3-(5-hydroxy-pentyloxy)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl]-pentanoic acid                                                                                                                                                              在
                                                                                                                                         
高氯酸                                                                                                                                                                                                                               吡啶   、                                                                                                  
sodium hydroxide   、                                                                                                  
氯化亚砜                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
(R)-4-[(3S,5R,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-Dihydroxy-3-(5-hydroxy-pentyloxy)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl]-pentanoic acid tert-butyl ester