1H-Pyridazino(4,5-b)carbazole-1,4(6H)-dione, 2,3-dihydro-5-ethyl- 2,3-Dihydro-5-ethyl-1H-pyridazino(4,5-b)carbazole-1,4(6H)-dione 59774-16-2 BRN 0551673 Dioxo-1,4 ethyl-5 tetrahydro-1,2,3,4 6H-pyridazino(4,5-b)carbazole