6α-bromo-5β-cholestane-3β,5,7β,19-tetraol 3,7,19-triacetate 生成 [(3S,5S,7R,8S,9S,10R,13R,14S,17R)-3,7-diacetyloxy-5-hydroxy-13-methyl-17-[(2R)-6-methylheptan-2-yl]-1,2,3,4,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-10-yl]methyl acetate