.alpha.,.alpha.,.alpha.',.alpha.'-Tetrabromo-p-xylene .omega.,.omega.,.omega.',.omega.'-Tetrabromo-p-xylene 1592-31-0 Benzene, 1,4-bis(dibromomethyl)- NSC30633 p-Xylene, .alpha.,.alpha.,.alpha.',.alpha.'-tetrabromo-