The CAS number is for its free base.

KR-62436 is a competitive inhibitor of dipeptidyl peptidase-IV (DPP-IV). DPP-IV is a serine protease which inactivates glucagon-like peptide (GLP-1); IC₅₀ 0.1-0.8 μM; GLP-1 is a potent stimulus for insulin secretion and inducer of satiety after food intake, but it has a very short action (1 min) because it is rapidly degraded by DPP-IV; blocking DPP-IV increases GLP-1 action and increases plasma insulin levels; DPP-IV inhibitors and KR-62436 have clinical potential as anti-diabetic agents.(Sigma-Aldrich)