2,2-Dimethyl-propionic acid (3S,5S,6S,8S,9S,10R,13S,14S,17S)-3-acetoxy-6-bromo-5-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
氢氧化钾                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 2,2-Dimethyl-propionic acid (3S,5S,6S,8S,9S,10R,13S,14S,17S)-6-bromo-3,5-dihydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl ester