Synonyms: Pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-, (S)-; Pyrrolo[1,2-a]pyrazine-1,4-dione, hexahydro-, L- (8CI);(S)-3,6-Dioxohexahydropyrrolo[1,2-a]pyrazine; Cyclo(Gly-L-Pro);Cyclo(L-prolylglycyl); Cyclo(Pro-Gly); Cyclo(glycyl-L-prolyl);Cyclo-L-prolylglycine; Cycloglycyl-L-proline; Cycloglycylproline;Glycyl-L-proline lactam