Synonyms: (2S,3aS,6aS)-Hexahydro-1-[(2S)-2-[[(1S)-1-[(1-methylethoxy)carbonyl]-3-phenylpropyl]amino]-1-oxopropyl]cyclopenta[b]pyrrole-2(2H)-carboxylic Acid; (2S,3aS,6aS)-Octahydro-1-[(2S)-2-[[(1S)-1-[(1-methylethoxy)carbonyl]-3-phenylpropyl]amino]-1-oxopropyl]cyclopenta[b]pyrrole-2-carboxylic Acid; USP Ramipril EP Impurity B; Ramipril EP Impurity B