4-22-00-00647 (Beilstein Handbook Reference) 4-Pyridinecarboxylic acid, (2-thienylmethylene)hydrazide 79728-82-8 BRN 0185287 ISONICOTINIC ACID, 2-THENYLIDENEHYDRAZIDE Isonicotinylhydrazone du 2-thiophenaldehyde [French]