1081-50-1 4-Pyridinecarboxylic acid, (1-carboxyethylidene)hydrazide 4-Pyridinecarboxylic acid, (1-carboxyethylidene)hydrazide (9CI) 5-22-02-00252 (Beilstein Handbook Reference) BRN 0185611 ISONICOTINIC ACID, (1-CARBOXYETHYLIDENE)HYDRAZIDE Isonicotinoylhydrazonopyruvic acid L 1011 NSC 97221