Lisinoprilr,S,S-Diketopiperazine

(2S)-2-[(3S,8aR)-3-(4-Aminobutyl)-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4-phenylbutanoic Acid; Lisinopril R,S,S-Diketopiperazine; (2S)-2-[(3S,8aR)-3-(4-Aminobutyl)-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4-phenylbutanoic Acid; Pyrrolo[1,2-a]pyrazine-2(1H)-acetic acid, 3-(4-aMinobutyl)hexahydro-1,4-dioxo-a-(2-phenylethyl)-, (aS,3S,8aR)-; Lisinopril EP IMpurity D;Lisinopril R,S,S-Diketopiperazine