Captopril Disulfide is a reversible and competitive inhibitor of LTA4 hydrolase (IC50=11 M). Captopril has been shown to be an of angiotensin converting enzyme-1 (ACE1), but not ACE2(IC50 = 22 nM). Captopril demonstrates irreversible noncompetitive and competitive inhibitor of tyrosinase monophenolase and diphenolase activities, respectively. Captopril has also been shown to inhibit the formation of angiotensin II, a bioactive peptide that stimulates angiogenesis and increases microvessel density.