Not less than 95.0%
(2S)-2-[(3S,5aS,9aS,10aR)-3-Methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]pentanoic Acid; 10aR-Perindoprilat Diketopiperazine; (S)-2-{(3S,5aS,9aS,10aR)-3-Methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl}pentanoic Acid;Perindopril Related Compound D (USP); Perindoprilat Lactam B