... Kojic acidChemical name: 5-hydroxy-2-hydroxymethyl-1,4-pyroneCAS NO. : 501-30-4 EINECS NO.: 207-922-4Molecular Formula: C6H6O4 ... Formula: Quality standard of Kojic acid, CAS: 501-30-4 ItemSpecificationResultsAppearanceWhite or off white crystalWhite or off white crystalPurity,%99 ... 3). Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) is easily dissolved in water, alcohol and acetone ...