n :  a carcinogenic dioxin C₁₂H₄O₂Cl₄ found esp. as a contaminant in 2,4,5-T - called also 2,3,7,8-tetrachlorodibenzo-para-dioxin, 2,3,7,8-tetrachlorodibenzo-p-dioxin  .
 
 
 
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