2,2-双(对氯苯基)-1,1-二氯乙烷
2,2-双(对氯苯基)-1,1-二氯乙烷（DDD）是DDT主要代谢产物之一。
1943年首先由Geigy公司合成。后来由Rohm Haas公司开发为商品。
Dichlorodiphenyldichloroethane
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Dichlorodiphenyldichloroethane 2,2-双(对氯苯基)-1,1-二氯乙烷
Dichlorodiphenyldichloroethane (DDD) is an organochlorine insecticide that is slightly irritating to the skin. DDD is a metabolite of DDT. DDD is colorless and crystalline; it is closely related chemically and is similar in properties to DDT, but it is considered to be less toxic to animals than DDT. The molecular formula for DDD is (ClC6H4)2CHCHCl2 or C14H10Cl4, whereas the formula for DDT is (ClC6H4)2CHCCl3 or C14H9Cl5.
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