(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-1-((S)-1-Hydroxy-ethyl)-9-methoxy-3a-methoxymethyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysen-13-one                                                                                                                                                              在
                                                                                                                                                                                 
chromium(VI) oxide   、                                                                                                  lithium aluminium tetrahydride   、                                                                                                  
硫酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃   、                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13S,13aR,13bR)-1-((R)-1-Hydroxy-ethyl)-9-methoxy-3a-methoxymethyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysen-13-ol