7-amino-2,6-dimethylpyrrolo[3,4-c]pyridine-1,3-dione

7-amino-2-methyl-(2,5-dioxo-1-methylpyrrolidin-3-yl)methyl-1,3-dihydropyrrolo<3,4-c>pyridine

7-amino-2-ethyl-6-methylpyrrolo[3,4-c]pyridine-1,3-dione