(2,2,2-Trichloro-acetyl)-carbamic acid (3S,8S,9S,10R,13S,14S,17S)-17-(tert-butyl-dimethyl-silanyloxymethyl)-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                                                                                                                                                              在
                                                                                                                                                                                 
aluminum oxide                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
Carbamic acid (3S,8S,9S,10R,13S,14S,17S)-17-(tert-butyl-dimethyl-silanyloxymethyl)-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