Catsyn offer gram to tons of Pyridine, 4,4'-[4',5'-bis[4-(4-pyridinyl)phenyl][1,1':2',1''-terphenyl]-4,4''-diyl]bis- | CAS 591215-20-2, its formula is C50H34N4, molecular weight is 690.83g/mol and the purity is usually NLT 98%.