乙酸酐 、
(3S,3aS,9aS,10aS,10bS)-3a,9a-Dimethyl-1,2,3,3a,4,5,6,7,8,9,9a,10,10a,10b-tetradecahydro-cyclopenta[a]fluoren-3-ol 在
吡啶 作用下,
生成 Acetic acid (3S,3aS,9aS,10aS,10bS)-3a,9a-dimethyl-1,2,3,3a,4,5,6,7,8,9,9a,10,10a,10b-tetradecahydro-cyclopenta[a]fluoren-3-yl ester