1,2,7,9-TCDD;1,2,7,9-Tetrachlorodibenzo[1,4]dioxin;1,2,7,9-Tetrachlorodibenzo[b,e][1,4]dioxin;1,2,7,9-Tetrachlorodibenzodioxin;1,2,7,9-Tetrachlorodibenzo-p-dioxin
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