3,5-Dihydro-4H-pyridazino(4,5-b)indol-4-one hydrazone trihydrochloride 4-Hydrazino-5H-pyridazino(4.5-b)indole trihydrochloride 4H-Pyridazino(4,5-b)indol-4-one, 3,5-dihydro-, hydrazone, trihydrochloride 70107-10-7