1,2,4,5-Tetrachloro-3,6-dimethylbenzene 1,2,4,5-Tetrachlorodimethylbenzene 2,3,5,6-Tetrachloro-p-xylene 877-10-1 Benzene, 1,2,4,5-tetrachloro-3,6-dimethyl- NSC66546 Tetrachloro-p-xylene p-Xylene, 2,3,5,6-tetrachloro-