27-trans-p-Coumaroyloxyursolic acid and 27-cis-p-coumaroyloxyursolic acid 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, ursolic acid, or be oxidized to taraxasterol and amyrin.
Ursonic acid methyl ester, an esterified derivative of Ursolic acid, 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.