(4aR,5R,6aS,6bR,8aR,9R,10R,11S,12aR,12bR,14bS)-5,10-Diacetoxy-9-acetoxymethyl-11-hydroxy-2,2,6a,6b,9,12a-hexamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-octadecahydro-2H-picene-4a-carboxylic acid methyl ester 在
吡啶 、 lithium aluminium tetrahydride 作用下,
生成
3β,16α,23,28-Tetrahydroxyolean-12-en