... materials, agriculture, food additives Basic information:Kojic acidChemical name: 5-hydroxy-2-hydroxymethyl-1,4-pyroneCAS NO. : 501-30-4 ... kindof subacid organic compound made in microbial fermentation. 2). Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4 ... ) . recommendation usage for cosmetics: 0.2~1.0%.(2) Raw Materials: Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501- ...