Synonyms: 4-Pyridinecarboxylicacid, [(2,4-dihydroxyphenyl)methylene]hydrazide (9CI); Hydrazine, 1-(2,4-dihydroxybenzylidene)-2-isonicotinoyl-(5CI); Isonicotinic acid, (2,4-dihydroxybenzylidene)hydrazide (7CI,8CI);2,4-Dihydroxybenzaldehyde isonicotinoylhydrazone; 2,4-Dihydroxybenzaldehydeisonicotinylhydrazone; NSC 51353; Resorcinal isonicotinoylhydrazone