1,2,3,4,6,7,8-Heptachlorodibenzo-para-dioxin (often referred to as 1,2,3,4,6,7,8-HpCDD) is a polychlorinated derivative of dibenzo-p-dioxin and can therefore be categorized as a polychlorinated dibenzo-p-dioxin (PCDD), a subclass of dioxins which includes 75 congeners.
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