1,4-Diethoxy-5-ethyl-6H-pyridazino(4,5-b)carbazole 126854-09-9 6H-Pyridazino(4,5-b)carbazole, 1,4-diethoxy-5-ethyl- BRN 5994808 Diethoxy-1,4 ethyl-5 6H-pyridazino(4,5-b)carbazole