(2S,3R,4S,4aR,6aR,6bS,8aR,11R,12S,12aR,14aR,14bR)-2,3-Dihydroxy-4,6a,6b,8a,11,12,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,14,14a,14b-icosahydro-picene-4-carboxylic acid methyl ester 在
氢氧化钾 作用下,
以
甲醇 为溶剂,
生成
2β,3β-Dihydroxy-ursen-(12)-carbonsaeure-(23), Comminsaeure-D