The structures of echinocystic and cochalic acids were confirmed as 3β,16β-dihydroxyolean-12-en-28-oic acid and 3β,16α-dihydroxyolean-12-en-28-oic acid respectively, by comparing the ease of acetonide formation of the corresponding triols.
R. Segal, F. Reicher and R. D. Youssefyeh, J. Chem. Soc., Chem. Commun., 1974, 481 DOI: 10.1039/C39740000481
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