Synonyms: [1,1'-Biphenyl]-4,4'-diamine,N,N'-bis(3-methylphenyl)-N,N'-diphenyl- (9CI);4,4'-Bis[N-(3-methylphenyl)-N-phenylamino]biphenyl;ELA 4021;N,N'-Bis(3-methylphenyl)-N,N'-diphenylbenzidine;N,N'-Diphenyl-N,N-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine;N,N'-Diphenyl-N,N'-bis(3-methylphenyl)-p-benzidine;N,N'-Diphenyl-N,N'-bis(3-methylphenyl)[1,1'-biphenyl]-4,4'-diamine;N,N'-Diphenyl-N,N'-bis(3-methylphenyl)benzidine;N,N'-Diphenyl-N,N'-bis(m-tolyl)[1,1'-biphenyl]-4,4'-diamine;N,N'-Diphenyl-N,N'-di(3-methylphenyl)-4,4'-diaminobiphenyl;N,N'-Diphenyl-N,N'-di(3-methylphenyl)benzidine;N,N'-Diphenyl-N,N'-di-m-tolylbiphenyl-4,4'-diamine;