... organic compound made in microbial fermentation. 2). Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) is whiteor off ... oxidation.Application: (1) Cosmetics: Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) is used for macula-removing ... .(3) Medicine: Kojic acid, (5-hydroxy-2-hydroxymethyl-1,4-pyrone, CAS: 501-30-4) has no mutagenic action to eukaryotic cells. It ...