2 3 7 8 tetrachlorodibenzodioxin tcdd July 8, 2019 16 32 64 128 Herbicide agent 2 3 7 8 tetrachlorodibenzodioxin tcdd 2 3 7 8 tetrachlorodibenzo p dioxin tcdd 2 3 7 8-tetrachlorodibenzo dioxin 2 3 7 8 tcdd 2 3 7 8-tetrachlorodibenzo-p-dioxin 2 3 7 8-tetrachlorodibenzo-p-dioxin health effects 2 3 7 8-tetrachlorodibenzodioxine