(1,1'-Biphenyl)-4,4'-diamine, N,N,N',N'-tetraethyl- 3-13-00-00430 (Beilstein Handbook Reference) 6860-63-5 BRN 2117611 Benzidine, N,N,N',N'-tetraethyl- N,N,N',N'-Tetraethylbenzidine