Product name: 2, 5-thiophenedicarboxylic acid Synonyms:thiophene-2,5-Dicarboxyl acid; Thiophene-2,5-dicarboxylic acid Molecular formula: C6H4O4S Molecular weight: 172.15 CAS No.: 4282-31-9 Appearance: off-white or yellow powder Purity: 99.00% min Ignition residue: 0.50% max Package: 25 kilogram cardboard barrels pack Application :2, 5-thiophenedicarboxylic acid can be mainly used in the production of fluorescent brightener Standard: Q/70894543-X. 3-2005.