Catsyn offer gram to tons of 4',5'-Bis(3,5-diformylphenyl)-3',6'-dimethyl-[1,1':2',1''-terphenyl]-3,3'',5,5''-tetracarbaldehyde | CAS 2764883-80-7, its formula is C40H26O8, molecular weight is 634.63g/mol and the purity is usually NLT 98%.