Synonyms: Pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-3-(2-methylpropyl)-, (3S-trans)-; Pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-3-isobutyl-, stereoisomer (8CI); 3-Isobutylhexahydropyrrolo [1,2-a]pyrazine-1,4-dione; Cyclo(L-Leu-L-Pro); Cyclo(L-Pro-D-Leu); Cyclo(L-Pro-L-Leu);Cyclo(L-leucyl-L-prolyl); Cyclo(L-prolyl-L-leucyl); Cyclo(Pro-Leu); Cyclo(proline-leucine);Cyclo-L-prolyl-L-leucine; Gancidin W; L-Leucyl-L-proline lactam;L-Leucyl-L-prolyl lactam; Maculosin 6