3-Hydroxy-5-hydroxymethyl-2-methyl-4-pyridincarbaldehyd 4-Pyridinecarboxaldehyde, 3-hydroxy-5-(hydroxymethyl)-2-methyl- (9CI) 5-21-13-00044 (Beilstein Handbook Reference) 66-72-8 BRN 0383768 EINECS 200-630-8 NSC 19613 PYRIDOXAL Pyridoxaldehyde