Pyriproxyfen/Pyridine
Pyriproxyfen(pyridine based) as an insect growth regulator is a junvenil hormone mimic, preventing larvae from reaching adult stages. This IGR was orginally used in the US to control whiteflies on cotton crops. It is also being used as a prevention for fleas on household pets.
In the US pyriproxyfen is often marketed under the trade name Nylar.