Acetic acid (3aR,5aS,5bS,7aS,8R,11aS,11bS,13aS,13bS)-3-isopropylidene-5a,5b,9,9,11a,13b-hexamethyl-icosahydro-cyclopenta[a]chrysen-8-yl ester                                                                                                                                                              在
                                                                                                                                                                                 lithium aluminium tetrahydride                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (3aR,5aS,5bS,7aS,8R,11aS,11bS,13aS,13bS)-3-Isopropylidene-5a,5b,9,9,11a,13b-hexamethyl-icosahydro-cyclopenta[a]chrysen-8-ol