4-22-00-00660 (Beilstein Handbook Reference) 4-Pyridinecarboxylic acid, (1-(4-pyridinyl)ethylidene)hydrazide 91803-29-1 BRN 0209030 ISONICOTINIC ACID, (1-(4-PYRIDYL)ETHYLIDENE)HYDRAZIDE Isonicotinylhydrazone de la 4-acetylpyridine [French]