丁烯酮 、
1,1-dimethyl-2α-hydroxy-2β-(1-hydroxyethyl)-7-keto-(3aβ,5aα,9aβ,9bα)-perhydrocyclopentanaphthalene 生成 (2S,3aR,5aR,10aS,11aR,11bR)-2-Hydroxy-2-((R)-1-hydroxy-ethyl)-1,1-dimethyl-1,2,3,3a,4,5,5a,6,9,10,10a,11,11a,11b-tetradecahydro-cyclopenta[a]anthracen-8-one