CAS 89639-83-8 appears in our catalog under these names: 4,5-Dimethyl-2-furoic acid, 95%, 4,5-Dimethylfuran-2-carboxylic acid, 95+%, 4,5-Dimethyl-2-furoic acid, 4,5-Dimethyl-2-furoic acid, 97% , 4,5-Dimethylfuran-2-carboxylic acid 95+%. Offered by: Combi-blocks, AmBeed, Biosynth, Thermo Scientific, Chemat. Available pack sizes: 250mg, 1g, 5g, 100mg, 500mg.