(2S)?-?1-?(2-?methylpropanoyl)?pyrrolidine-?2-?carboxylic Acid (Captopril EP Impurity E) is an impurity of Captopril (C175750), an orally active angiotensin-converting enzyme (ACE) inhibitor(1) which acts as a neuroprotective & neuroresearch product.
![(2S)-1-[2-Methylpropanoyl]-pyrrolidine-2-carboxylic Acid](https://www.chemicalbook.com/CAS/20130318/GIF/CB92605022.gif)