2,3,7-Tbdd 2,3,7-Tribromobenzo-4-dioxin 2,3,7-Tribromobenzo-p-dioxin 2,3,7-Tribromodibenzo-p-dioxin 51974-40-4 Dibenzo(b,e)(1,4)dioxin, 2,3,7-tribromo-