Acetic acid (4S,5S,8S,9S,10R,13S,14S,17S)-4,10,13-trimethyl-3-oxo-hexadecahydro-20-oxa-cyclopropa[4,5]cyclopenta[a]phenanthren-17-yl ester                                                                                                                                                                                              以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 Acetic acid (3aR,3bS,5aS,6S,8aS,8bR,11aR)-3a,5a,11a-trimethyl-1,11-dioxo-hexadecahydro-indeno[5,4-e]azulen-6-yl ester