1H-Pyrazole-4-carbonitrile, 5-amino-1-(6-hydrazino-3-pyridazinyl)- 5-25-17-00459 (Beilstein Handbook Reference) 5-Amino-1-(6-hydrazino-3-pyridazinyl)-1H-pyrazole-4-carbonitrile 69720-57-6 BRN 0888735