1,2,3,4,6,7,8-HEPTACHLORODIBENZOFURAN 1,2,3,4,6,7,8-Hepta polychlorinated dibenzofuran 1,2,3,4,6,7,8-Heptachlorodibenzofuran [Dioxin and Dioxin-Like compounds] 67562-39-4 Dibenzofuran, 1,2,3,4,6,7,8-heptachloro- F 131