.alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.',2,5-Octachloro-p-xylene 1,4-Dichloro-2,5-bis(trichloromethyl)benzene 2142-29-2 Benzene, 1,4-dichloro-2,5-bis(trichloromethyl)- NSC145876 p-Xylene, .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.',2,5-octachloro-