Lisinopril-EP-Imp-C;Lisinopril EP Impurity C ((S, S, S)-Diketopiperazine);(2S)-2-[(3S,8aS)-3-(4-Aminobutyl)-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4-phenylbutanoic Acid;(2S)-2-[(3S,8aS)-3-(4-Aminobutyl)-1,4-dioxohexahydropyrrolo[1,2-α]pyrazin-2(1H)-yl]-4-phenylbutanoic Acid;Lisinopril S,S,S-Diketopiperazine Discontinued see: L468990;Lisinopril EP IMpurity C;Lisinopril Related CoMpound A;Lisinopril dihydrate impurity C