1,4-Dichloro-5-ethyl-6H-pyridazino(4,5-b)carbazole 59774-21-9 6H-Pyridazino(4,5-b)carbazole, 1,4-dichloro-5-ethyl- BRN 0557473 Dichloro-1,4 ethyl-5 6H-pyridazino(4,5-b)carbazole