diceto-3,12,5β cholene-8,14 oate-24 de methyle 在
potassium chromate 、
乙酸酐 、
溶剂黄146 作用下,
以
苯 为溶剂,
生成 (R)-4-((5R,9R,10S,13R,17R)-10,13-Dimethyl-3,12,15-trioxo-2,3,4,5,6,7,9,10,11,12,13,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester