Catsyn offer gram to tons of [1,1':3',1''-Terphenyl]-4,4''-dicarboxylic acid, 5'-ethynyl-, 4,4''-diethyl ester | CAS 1361344-16-2, its formula is C26H22O4, molecular weight is 398.45g/mol and the purity is usually NLT 98%.