乙酸酐 、
dimethyl 2α,3β-diacetyl-19α-hydroxybartogenate 在
高氯酸 作用下,
以0.025 g的产率得到(2R,3R,4R,4aR,6aR,6bS,8aR,12S,12aS,14aR,14bR)-2,3,12-Triacetoxy-4,6a,6b,11,11,14b-hexamethyl-2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,12a,14,14a,14b-octadecahydro-1H-picene-4,8a-dicarboxylic acid dimethyl ester