organic molecular entity Chlorendic Acid 1,4,5,6,7,7-hexachlorobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid A bridged organochlorine compound resulting from the Diels-Alder reaction of hexachlorocyclopentadiene with maleic anhydride followed by hydrolysis of the resulting anhydride. A chemical intermediate used in the preparation of fire-retardant polyester resins and plasticisers. C9H4Cl6O4 CAS:115-28-6 OC(=O)C1C(C(O)=O)C2(Cl)C(Cl)=C(Cl)C1(Cl)C2(Cl)Cl