Synonyms: o-Tolidine; C.I. 37230; Azoic diazo component 113; DMB; Fast Dark Blue Base R; 1'-biphenyl)-4,4'-diamine,3,3'-dimethyl-; (1'-Biphenyl)-4,4'-diamine-3,3'-dimethyl-; (1,1'-biphenyl)-4,4'-diamine-3,3'-dimethyl-; (1'-biphenyl]-4,4'-diamine,3,3'-dimethyl-; [2-Tolidin; 2-Tolidina; 2-Tolidine; 3,3'-dimethyl-4,4'-biphenyldiamine; 3,3'-dimethyl-[1,1'-biphenyl]-4,4'- diamine; 3,3'-dimethyl-[1,1'-biphenyl]-4,4'-diamine