(1R,4aR,4bS,7S,8aR,10aR)-7-(2-Hydroxy-ethyl)-1,4a,7-trimethyl-8-oxo-tetradecahydro-phenanthrene-1-carboxylic acid methyl ester   、                                                                                      
甲基磺酰氯                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (1R,4aR,4bS,7S,8aR,10aR)-7-(2-Methanesulfonyloxy-ethyl)-1,4a,7-trimethyl-8-oxo-tetradecahydro-phenanthrene-1-carboxylic acid methyl ester