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(S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-L-proline

A potent and specific inhibitor of Peptidyl-Dipeptidase A. It blocks the conversion of Angiotensin I to Angiotensin II, a vasoconstrictor and important regulator of Arterial Blood Pressure. Captopril acts to suppress the Renin-Angiotensin System and inhibits Pressure responses to exogenous Angiotensin.