Similarly, an isomer of aldrin, known as "'isodrin "', is produced by reaction of hexachloronobornadiene with cyclopentadiene.
2.
It may, however, be released when such materials are subjected to hydrolysis, and can be formed by oxidation of chlorinated cyclodiene insecticides ( e . g . endosulfan, chlordane, heptachlor, aldrin, dieldrin, endrin, and isodrin ).