<unk>  is an organochlorine compound that was used as an insecticide. Usually sold as a white or tan powder,<unk>  is one of the cyclodiene insecticides. In 1962, Rachel Carson's Silent Spring questioned the safety of<unk>  and other chlorinated insecticides. Due to its highly stable structure,<unk>  can persist in the environment for decades. In the United States, the Environmental Protection Agency has limited the sale of<unk>  products to the specific application of fire ant control in underground transformers. The amount that can be present in different foods is regulated.
Heptachlor
Vinyl chloride
Triphenylchloroethylene
Methanol
Beta-Hexachlorocyclohexane
Alpha-Hexachlorocyclohexane
Triphenylbromoethylene
Coal tar