Propionic acid (8R,9S,10S,13S,14S,17S)-2-bromo-10,13-dimethyl-3-oxo-8,9,10,11,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthren-17-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
溴叠氮化物                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 Propionic acid (6S,7S,8R,9S,10S,13S,14S,17S)-7-azido-2,6-dibromo-10,13-dimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl ester