Dichlorvos is an organic compound with the chemical name O,O-dimethyl-O-(2,2-dichlorovinyl) phosphate and the molecular formula C4H7Cl2O4P.It is a commonly used environmental hygiene pesticide for killing mosquitoes, flies, bedbugs, cockroaches and other pests. Dichlorvos is a highly toxic compound that is also harmful to humans and animals.