1-Hydrazino-4-(3,5-dimethyl)-1-pyrazolyl-5H-pyridazino(4,5-b)indole 135561-92-1 135561-93-2 1H-Pyridazino(4,5-b)indol-1-one, 4-(3,5-dimethyl-1H-pyrazol-1-yl)-2,5-dihydro-, hydrazone HDPPI