3β-Acetoxy-20β,28-epoxy-18α,19βH-ursane-21,22-dione 在
氢氧化钾 作用下,
以
乙醇 、
苯 为溶剂,
反应 1.0h,
以30 mg的产率得到(1S,2R,4aR,6aR,6bR,8aR,10S,12aR,12bR,14aR,14bS,15R)-10-acetoxy-15-hydroxy-1,2,6a,6b,9,9,12a-heptamethyloctadecahydro-2H,4H-2,4a-methanophenanthro[2,1-f]isochromene-15-carboxylic acid