2-ethyl 7,9-dimethyl 3-diazo-4,5-dioxo-4,5-dihydro-3H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate

trimethyl 4,5-dimethoxy-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate