Captopril STD- 5-[3-(tert-butylamino)-2-hydroxypropoxy]-1,2,3,4-tetrahydroquinolin-2-one
Captopril EP Impurity F- (2S)-1-[(2R)-2-methyl-3-sulfanylpropanoyl]pyrrolidine-2-carboxylic acid; (2S)-1-[(2R)-2-Methyl-3-sulphanylpropanoyl]pyrrolidine-2-carboxylic Acid; (S)-1-((R)-3-Mercapto-2-methylpropanoyl)pyrrolidine-2-carboxylic Acid