三氧化硫吡啶   、                                                                                      Acetic acid 17-((R)-1-hydroxy-ethyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester                                                                                                                                                                                              以
                                                                                         
氯仿                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以88%的产率得到Acetic acid 10,13-dimethyl-17-((R)-1-sulfooxy-ethyl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester; compound with pyridine