has role antiviral agent antifibrotic agent captopril A <small>L</small>-proline derivative in which <small>L</small>-proline is substituted on nitrogen with a (2<i>S</i>)-2-methyl-3-sulfanylpropanoyl group. It is used as an anti-hypertensive ACE inhibitor drug. CHEBI:3380 EC 3.4.15.1 (peptidyl-dipeptidase A) inhibitor hypoglycemic agent antineoplastic agent pyrrolidinemonocarboxylic acid N-acylpyrrolidine alkanethiol N-acyl-amino acid L-proline derivative