CYCLO(-PRO-VAL)

Cyclo(L-Val-L-Pro-)

Cyclo(L-Pro-L-Val-)

(3S,8aα)-3β-Isopropyloctahydropyrrolo[1,2-a]pyrazine-1,4-dione

(3S,8aS)-Octahydro-3-(1-methylethyl)pyrrolo[1,2-a]pyrazine-1,4-dione

(3S,8aS)-3β-Isopropyl-6,7,8,8a-tetrahydropyrrolo[1,2-a]pyrazine-1,4(2H,3H)-dione