3.4.5.6-Tetrachlor-o-xylol, tetrachloro-o-xylene, Benzene,1,2,3,4-tetrachloro-5,6-dimethyl, tretrachloro-o-xylene, Tetrachloro-o-xylen; 3,4,5,6-Tetrachlor-1,2-dimethylbenzol; Tetrachloro-o-xylene,[solid]; Benzene, 1,2,3,4-tetrachloro-5,6-dimethyl-; 1,2,3,4-Tetrachloro-5,6-dimethylbenzene.; 1.2-Dimethyl-3,4,5,6-tetrachlor-benzol; 1,2,3,4-Tetrachlor-5,6-dimethyl-benzol;