Ramipril EP impurity K

[3s-[2(r*),3a,5ab,8ab,9ab]]-decahydro-3-methyl-1,4-dioxo-a-(2-phenylethyl)-2h-cyclopenta[4,5]pyrrolo[1,2-a]pyrazine-2-acetic acid ; ramiprilat diketopiperazine ; ramipril impurity – k (ep) ; [3s-[2(r*),3a,5a,8a,9a]]-decahydro-3-methyl-1,4-dioxo-a-(2-phenylethyl)-2h-cyclopenta[4,5]pyrrolo[1,2-a]pyrazine-2-acetic acid ; ramipril diketopiperazine acid ; (αs,3s,5as,8as,9as)-decahydro-3-methyl-1,4-dioxo-α-(2-phenylethyl)- 2h-cyclopenta[4,5]pyrrolo[1,2-a]pyrazine-2-acetic acid ; [3s-[2(r*),3α,5aβ,8aβ,9aβ]]-decahydro-3-methyl-1,4-dioxo-α-(2-phenylethyl)-2h-cyclopenta[4,5]pyrrolo[1,2-a]pyrazine-2-acetic acid ; ramipril ep impurity k ; ramiprilat diketopiperazine (mixture of diastereoisomers)