3,3',4,4'-Biphenyltetracarboxylic acid

3,3',4,4'-Biphenyltetracarboxylic acid (CAS 22803-05-0) is manufactured by XiaoDu Technology (Guangdong) Co., Ltd. to pharmaceutical grade under Chinese Pharmacopoeia (ChP) reference, marketed as a raw material for polyimide (PI) production. Samples are available, and the manufacturer supplies the product to Asia, North America, Europe, Australasia, the Middle East and Africa.