乙酸酐 、
3beta,17,20-三羟基-5alpha-羊毛甾-7,9(11)-二烯-18-酸 gamma-内酯 在
lithium aluminium tetrahydride 作用下,
生成 ((3S,5R,10S,13S,14S,17R)-3-acetoxy-17-hydroxy-17-((S)-2-hydroxy-6-methylheptan-2-yl)-4,4,10,14-tetramethyl-1,2,3,4,5,6,10,12,14,15,16,17-dodecahydro-13H-cyclopenta[a]phenanthren-13-yl)methyl acetate