Similar names: Chlorendic acid; 5-Norbornene-2,3-dicarboxylic acid, 1,4,5,6,7,7-hexachloro- (6CI,8CI); 1,4,5,6,7,7-Hexachlorobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid; 1,4,5,6,7,7-Hexachloro-5-norbornene-2,3-dicarboxylic acid; 1,4,5,6,7,7-Hexachlorobicyclo-(2,2,1)hept-5-en-2,3-dicarboxylic acid; 1,4,5,6,7,7-Hexachlorodicyclo-(2.2.1)-5-heptene-2,3-dicarboxylic acid; 2H,3H-Hexachlorobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid; Chlorendic acid; HET acid; Hexachloroendomethylenetetrahydrophthalic acid; NSC 22231; NSC 41876