(3a
S)-4
c-acetoxy-2,2-dimethyl-(3a
r,8a
t,8b
c)-3a,4,5,8,8a,8b-hexahydro-[1,3]dioxolo[4,5-
e]indazole-5a
t-carboxylic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
对甲苯磺酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
(3aS)-6-acetyl-4c-hydroxy-2,2-dimethyl-(3ar,8at,8bc)-3a,4,5,6,8a,8b-hexahydro-[1,3]dioxolo[4,5-e]indazole-5at-carboxylic acid methyl ester