Lisinopril (R,S,S)-Isomer

: Lisinopril (1R)-Epimer; Lisinopril EP Impurity E; (2S)-1-[(2S)-6-Amino-2-[[(1R)-1-carboxy-3-phenylpropyl]amino]hexanoyl]pyrrolidine-2-carboxylic acid; N2-[(1R)-1-Carboxy-3-phenylpropyl)-L-lysyl]-L-proline ;