1,4,5,6,7,7-Hexachlorobicyclo [2.2.1]hept-5-ene-2,3-dicarboxylic anhydride; Hexachloro-5-norbornene-2,3-dicarboxylic anhydride; Hexachloroendomethylenetetrahydrophthalic anhydride; 4,7-Methanoisobenzofuran-1,3-dione, 4,5,6,7,8,8-hexachloro-3a,4,7,7a-tetrahydro-; HET Anhydride; 4,5,6,7,8,8-Hexachloro-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1,3-dione; Chlorendic anhydride; Bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride, 1,4,5,6,7,7-hexachloro-; 5-Norbornene-2,3-dicarboxylic anhydride, 1,4,5,6,7,7-hexachloro-; 1,4,5,6,7,7-hexachloro-8,9,10-trinorborn-5-ene-2,3-dicarboxylic anhydride; 1,4,5,6,7,7-Hexachloro-5-norbornene-2,3-dicarboxylic anhydride; Chloran 542; NSC 22229; Hexachloroendomethylene tetrahydrophthalic anhydride; 1,4,5,6,7,7-Hexachlorobicyclo[2.2.1]-5-heptene-2,3-dicarboxylic acid anhydride
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