S-(Pentafluoro-6-methylbenzene) Captopril (Proline-2,5,5-d3) is deuterium labeledS-(Pentafluoro-6-methylbenzene) Captopril (P227195). S-(Pentafluoro-6-methylbenzene) 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.