BEC is a boronic acid-based arginine analog that acts as a slow-binding, competitive transition state inhibitor of arginase I and II (Ki = 310 nM for human recombinant type II arginase, pH 7.5).

CB-1158 (INCB-01158) is a potent, selective, oral available Arginase inhibitor with IC50 of 98 nM.

nor-NOHA (Nω-Hydroxy-nor-L-arginine) monoacetate is a potent and selective arginase inhibitor. nor-NOHA monoacetate inhibits rat liver arginase with a Ki of 0.5 μM.

ARG1-IN-1 is a human arginase 1 inhibitor with an IC50 of 29 nM.