Perindopril EP Impurity F

Ethyl (2S)-2-[(3S,5aS,9aS,10aS)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]pentanoate; Perindopril (10aS)-Dione; S)-Ethyl 2-{(3S,5aS,9aS,10aS)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl}pentanoate, Perindopril Related Compound F (USP);