重氮甲烷 、
3-sulfate of echinocystic acid 以
乙醚 为溶剂,
以7 mg的产率得到(4aR,5R,6aS,6bR,8aR,10S,12aR,12bR,14bS)-5-Hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-sulfooxy-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