Acetic acid (3S,5S,8S,9S,10S,11R,12S,13S,14S)-17-acetyl-10,13-dimethyl-2,3,4,5,6,7,8,9,10,11,12,13,14,15-tetradecahydro-1H-20-oxa-cyclopropa[11,12]cyclopenta[a]phenanthren-3-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
高氯酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
11β-Hydroxy-3β.12α-diacetoxy-5α-pregnen-(16)-on-(20)