27-trans-p-Coumaroyloxyursolicacid and 27-cis-p-coumaroyloxyursolicacid show potent inhibitory activity in the acyl CoA cholesteryl acyl transferase (ACAT) assay.
Friedelinol is a pentacyclic trierpene plant as the free acid or the aglycone for many saponins. Friedelinol can rearrange to the isomer, ursolicacid, or be oxidized to taraxasterol and amyrin.
Ursonic acid methyl ester, an esterified derivative of Ursolicacid, exhibits growth inhibitory activity against four tumor cell lines: HL-60, BGC, Bel-7402, and Hela, and the ED50 values for inhibition are >100 μg ml.