1,4-Dioxoperhydropyrrolo[1,2-a]pyrazine;Cyclo(glycylprolyl); Glycine, cyclic dipeptide with proline; Hexahydropyrrolo[1,2-a]pyrazine-1,4-dione;Proline, cyclic dipeptide with glycine; Pyrrolopiperazine-2,5-dione
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