1,2-Diisonicotinoylhydrazine 4-Pyridinecarboxylic acid, 2-(4-pyridinylcarbonyl)hydrazide (9CI) 4329-75-3 Hydrazine, 1,2-diisonicotinoyl- (8CI) N,N'-Diisonicotinoylhydrazine NSC 39301 NSC 52961 NSC 641284