[4S-(4α,5aα,5bα,8β,9α,9aR*,10aβ,11aβ)]-8-(1-methylethyl)-4,5a,5b,8,9,10a,11,11a-octahydro-4,5b,8,9-tetrahydroxy-5a-methyl-1H-oxireno[8a,9]phenanthro[1,2-c]furan-3(5H)-one                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
丁二酸酐   、                                                                                                  
4-二甲氨基吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         DMF (N,N-dimethyl-formamide)                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                生成                                                 
[4S-(4α,5aα,5bα,8β,9α,9aS*,10aβ,11aβ)]-3,4,5,5a,5b,8,9,10a,11,11a-decahydro-5b,8-dihydroxy-5a-methyl-8-(1-methylethyl)-3-oxo-1H-oxireno[8a,9]phenanthro[1,2-c]furan-4,9-diyl ester of butanedioic acid