Dioxins and
dioxin-like compounds. ... PCDDs are derivatives of dibenzo-p-
dioxin. There are 75 PCDD congeners, differing in the number and location of chlorine atoms, and seven of them are especially toxic, the most dangerous being 2,3,7,8-Tetrachlorodibenzodioxin (TCDD) Polychlorinated dibenzofurans (PCDFs), or
furans.
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