3,5-Dihydro-5-methyl-4H-pyridazino(4,5-b)indol-4-one hydrazone 4-Hydrazino-5-methyl-5H-pyridazino(4,5-b)indole 4H-Pyridazino(4,5-b)indol-4-one, 3,5-dihydro-5-methyl-, hydrazone 74396-97-7 BRN 4469618