n4,n4'-dipheny-n4,n4'-bis(9-phenyl-9h-carbazol-3-yl)biphenyl-4,4'-diamine
name：n4,n4'-dipheny-n4,n4'-bis(9-phenyl-9h-carbazol-3-yl)biphenyl-4,4'-diamine cas no.：887402-92-8 purity：99.90%