Synonyms: Benzidine,N,N,N',N'-tetra-p-tolyl- (7CI); [1,1'-Biphenyl]-4,4'-diamine,N,N,N',N'-tetrakis(4-methylphenyl)- (9CI);N,N,N',N'-Tetra(4-methylphenyl)-1,1'-biphenyl-4,4'-diamine;N,N,N',N'-Tetra-p-tolyl-(1,1'-biphenyl)-4,4'-diamine;N,N,N',N'-Tetrakis(4-methylphenyl)benzidine;N,N',N'',N'''-Tetrakis(4-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine; OSA 6140;TTB; Tetra-p-tolylbiphenyl-4,4'-diamine