Acetic acid (8R,9S,13S,14S,16S,17R)-16-ethyl-16-hydroxy-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
三氯氧磷                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
Acetic acid (8R,9S,13S,14S,17S)-16-eth-(E)-ylidene-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester