... , 3). Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) is easily dissolved in water, alcohol and acetone; slightly ... ) Cosmetics: Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) is used for macula-removing and whitening.In the ... ) Medicine: Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) has no mutagenic action to eukaryotic cells. It is ...