sodium (S)-1-((S)-1-((S)-2-(((S)-1-carboxylato-3-phenylpropyl)amino)propanoyl)pyrrolidine-2-carbonyl)pyrrolidine-2-carboxylate ; (2S)-1-[[(2S)-1-[(2S)-2-[[(1S)-1-Carboxy-3-phenylpropyl]amino]propanoyl]pyrrolidin-2-yl]carbonyl]pyrrolidine-2-carboxylic acid disodium salt ; Enalaprilat EP Impurity E (Di-Sodium Salt)