Catsyn offer gram to tons of 4',5'-Bis(4-formylphenyl)-3',6'-dimethyl-[1,1':2',1''-terphenyl]-4,4''-dicarbaldehyde | CAS 2363716-37-2, its formula is C36H26O4, molecular weight is 522.59g/mol and the purity is usually NLT 98%.