(1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-diamino-5,5'-dimethyl- 2,2'-Biphenyldisulfonic acid, 4,4'-diamino-5,5'-dimethyl- (8CI) 3,3'-Tolidine-6,6'-disulfonic acid 4,4'-Diamino-5,5'-dimethyl-2,2'-biphenyldisulfonic acid 4,4'-Diamino-5,5'-dimethylbiphenyl-2,2'-disulphonic acid 83-83-0 AI3-52695 EINECS 201-505-0 NSC 37128