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Catsyn offer gram to tons of N,N'-Bis[4-(1-naphthalenylphenylamino)phenyl]-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine | CAS 209980-47-2, its formula is C68H50N4, molecular weight is 923.15g/mol and the purity is usually NLT 98%.