S-(3-Acetylanisole-d3) Captopril is deuterium labeledS-(3-Acetylanisole) Captopril (A168530).S-(3-Acetylanisole) Captoprilis a related compound of Captopril (C175750), which is a competitive inhibitor ofangiotensin-converting enzyme (ACE) that convertsangiotensin I (AT I) to angiotensin II (AT II).Captopril can be used to treathypertension.