Also Called: 1,2,3,6,7,8 Hexachlorodibenzo-p-dioxin; 1,2,3,6,7,8-hexachlorodibenzo-p-dioxin (HxDD);1,2,3,6,7,8-HEXACHLORODIBENZO-P-DIOXIN;1 ,2,3,6,7,8-Hexachlorodibenzo-p-dioxin;(HxCDD);Hexachlorodibenzo-p-dioxin (HxCDD), mixture of 1,2,3,6,7,8-HxCDD and 1,2,3,7,8,9-HxCDD;1,2,3,6,7,8 Hexachlorodibenzop-dioxin;1,2,3,6,7,8-HxCDD