4-Pyridinecarboxylic acid, ((3-hydroxy-5-(hydroxymethyl)-2-methyl-4-pyridinyl)methylene)hydrazide 737-86-0 BRN 3685006 Isonicotinic acid, ((3-hydroxy-5-(hydroxymethyl)-2-methyl-4-pyridyl)methylene)hydrazide Isonicotinic acid, hydrazide, hydrazone with pyridoxal NSC 77674 PIH Pyridoxal isonicotinoyl hydrazone