Also Called: 1,2,3,4,6,7,8 Heptachlorodibenzo-p-dioxin;1,2,3,4,6,7,8-HEPTACHLORODIBENZO-P-DIOXIN;1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin (HpDD);1,2,3,4,6,7,8 Heptachlorodibenzo-p-dioxin (HpCDD);1,2,3,4,6,7,8-HEXACHLORODIBENZO-P-DIOXIN;1,2,3,4,6,7,8-heptachlorodibenzodioxin;1,2,3,4,6,7,8-HpCDD