1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin mixed with 1,2,3,7,8,9-hexachlorodibenzo-p-dioxin 1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin mixed with 1,2,3,6,7,8-hexachlorodibenzo-p-dioxin Dibenzo-p-dioxin, 1,2,3,7,8,9-hexachloro- mixed with 1,2,3,6,7,8-hexachlorodibenzo-p-dioxin (2:1) HP3315000 NCI-C03703