3-Epiursolic Acid is a triterpenoid isolated from Myrtaceae, acts as a competitive inhibitor of cathepsin L (ICIC50, 6.5 μM; Ki, 19.5 μM), with no obvious effect on cathepsin B[1]. IC50: 6.5 μM (Cathepsin L)[1]Ki: 19.5 μM (Cathepsin L)[1]
[1]. 3-Epiursolic Acid, et al. Triterpenoids as novel natural inhibitors of human cathepsin L. Chem Biodivers. 2014 Sep;11(9):1354-63.

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