【求助】邻联甲苯胺是否是邻甲联苯胺？？

二者是指同一个化合物,
邻联甲苯胺o-tolidine(ortho-Tolidine) [119-93-7],
3,3'-Dimethyl-1,1'-Biphenyl-4,4'-Diamine

ortho-Tolidine [119-93-7]
Synonyms: o,o'-tolidine; ortho-Tolidine; 3,3'-Dimethyl-1,1'-Biphenyl-4,4'-Diamine; 3,3'-dimethyl-4,4'-biphenyldiamine; 3,3'-Dimethylbenzidine; 3,3'-DIMETHYLBENZIDINE (O-TOLIDINE); 3,3'-Dimethylbiphenyl-4,4'-diamine; 3,3'-tolidine; 4,4'-bi-o-toluidine; 4,4'-diamino-3,3'-dimethylbiphenyl; diaminoditolyl; bianisidine; dimethyl benzidine; Dimethylbenzidine, 3,3-? C.I. 37230; C.I. azoic diazo component 113; DMB; Fast Dark Blue Base R; Tolidine;
C14H16N2

我有点看不懂

celan 发表:ortho-Tolidine [119-93-7]
Synonyms: o,o'-tolidine; ortho-Tolidine; 3,3'-Dimethyl-1,1'-Biphenyl-4,4'-Diamine; 3,3'-dimethyl-4,4'-biphenyldiamine; 3,3'-Dimethylbenzidine; 3,3'-DIMETHYLBENZIDINE (O-TOLIDINE); 3,3'-Dimethylbiphenyl-4,4'-diamine; 3,3'-tolidine; 4,4'-bi-o-toluidine; 4,4'-diamino-3,3'-dimethylbiphenyl; diaminoditolyl; bianisidine; dimethyl benzidine; Dimethylbenzidine, 3,3-? C.I. 37230; C.I. azoic diazo component 113; DMB; Fast Dark Blue Base R; Tolidine;
C14H16N2

这个东西是作什么用的，可以透露一下吗，谢谢

水中的余氯，
这是一个很老的方法！！！