Catsyn offer gram to tons of 5'-((3,5-Dicarboxyphenyl)ethynyl)-[1,1':3',1''-terphenyl]-4,4''-dicarboxylic acid | CAS 1542480-30-7, its formula is C30H18O8, molecular weight is 506.46g/mol and the purity is usually NLT 98%.