(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-1-Acetyl-9-methoxy-3a-methoxymethyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysen-13-one                                                                                                                                                              在
                                                                                                                                                                                 lithium aluminium tetrahydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  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