
Endosulfan is an off-patent organochlorine insecticide and acaricide that is being phased out globally. The two isomers, endo and exo, are known popularly as I and II. Endosulfan sulfate is a product of oxidation containing one extra O atom attached to the S atom. Endosulfan became a highly controversial agrichemical due to its acute toxicity, pot...
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http://en.wikipedia.org/wiki/Endosulfan

<chemical> A polychlorinated compound used for controlling a variety of insects. It is practically water-insoluble, but readily adheres to clay particles and persists in soil and water for several years. Its mode of action involves repetitive nerve-discharges positively correlated to increase in temperature. This compound is extremely toxic t...
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http://www.encyclo.co.uk/local/20973

a chlorinated hydrocarbon insecticide and miticide, CHClOS, in widespread use on food and forage crops.
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https://www.infoplease.com/dictionary/endosulfan
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