Synonyms: 2-Cyclopenten-1-one,hexachloro- (6CI,7CI); 2,3,4,4,5,5-Hexachloro-2-cyclopenten-1-one;Hexachloro-2-cyclopenten-1-one; Hexachloro-2-cyclopentenone; Hexachloro-D2-cyclopentenone;Hexachlorocyclopenten-3-one; NSC 41893; NSC 54734; NSC 61284;Perchloro-2-cyclopentenone; Perchlorocyclopenten-3-one