(2S,2'S)-diethyl 2,2'-((2S,5S)-2,5-dimethyl-3,6-dioxopiperazine-1,4-diyl)bis(4-phenylbutanoate),(2S,2'S)-diethyl 2,2'-((2S,5S)-2,5-dimethyl-3,6-dioxopiperazine-1,4-diyl)bis(4-phenylbutanoate),"it is an impurity of Ramipril, an antihypertensive agent that exerts inhibitory activities towards the angiotensin converting enzyme ;Impurity in commercial preparations of Ramipril",Ramipril Impurity