(3S,8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-((R)-4-((R)-2,2,5,5-tetramethyl-1,3-dioxolan-4-yl)butan-2-yl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl acetate 在
吡啶 、
盐酸 作用下,
生成
25-hydroxycholesta-5,7-dien-3β,24-diyl diacetate