TCDD

C12H4Cl4O2. TCDD or 2,3,7,8-TCDD is one of the most potent toxic dioxins and used as a reference for all other dioxins. 1,2,3,7,8-Pentachlorodibenzodioxin is of a similar potency, while the other members of the subset are 10"10 000 times less toxic.

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