2,3,4,7,8-PENTACHLORODIBENZOFURAN 2,3,4,7,8-Pentachlorodibenzofuran [Dioxin and dioxin-like compounds] 2,3,4,7,8-Pentapolychlorinated dibenzofuran 4-PeCDF 57117-31-4 CCRIS 3492 Dibenzofuran, 2,3,4,7,8-pentachloro- HSDB 7178