3,3',4,4'-Biphenyltetramine, tetrahydrochloride 3,3',4,4'-Tetraaminobiphenyl tetrahydrochloride 3,3'-Diaminobenzidine tetrahydrochloride 3,3'-Diaminobenzidine-4HCl 3,3'-Diammoniumbenzidinium tetrachloride 7411-49-6 NSC75650 [1,1'-Biphenyl]-3,3',4,4'-tetramine, tetrahydrochloride