<unk>  is an organochlorine insecticide which is oxidized in the insect to form dieldrin, a neurotoxin.<unk>  was formerly used to kill soil insects such as termites and grasshoppers to protect crops such as corn and potatoes. It has been classified as a persistent organic pollutant. Due to health concerns regarding dieldrin, it is no longer manufactured or used in the United States. In addition,<unk>  is itself a carcinogen and mutagen. The last American farm to use the pesticide was Emily Farms, in Covina, CA.
It can be formed from the synthesis of hexachloro-1,3-cyclopentadiene with norbornadiene in a Diels-Alder reaction.
Aldrin
Pentostatin
Captodiame
Elcatonin
Bergapten
Retapamulin
Tyrothricin
Somatrem