Acetic acid (1R,2R,5S,10S,13S,17S)-1,10,13-trimethyl-3-oxo-hexadecahydro-20-oxa-cyclopropa[1,2]cyclopenta[a]phenanthren-17-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
aluminum oxide   、                                                                                                  sodium tetrahydroborate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
水   、                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        以330 mg的产率得到1α,2α-epoxy-1β-methyl-5α-androstane-3α,17β-diol 17-monoacetate