Captopril (SQ 14225) hydrochloride, antihypertensive agent, is a thiol-containing competitive, orally active angiotensin-converting enzyme (ACE) inhibitor ( IC 50 =0.025 μM) and has been widely used for research of hypertension and congestive heart failure. Captopril hydrochloride is also a New Delhi metallo-β-lactamase-1 (NDM-1) inhibitor with an IC 50 of 7.9 μM.