Synonyms: 4-Cyclopentene-1,3-dione,tetrachloro- (6CI,7CI); 2,3,5,5-Tetrachloro-2-cyclopentene-1,4-dione; NSC44613; Perchloro-4-cyclopentene-1,3-dione; Perchlorocyclopentene-3,5-dione;Tetrachloro-2-cyclopentene-1,4-dione; Tetrachloro-4-cyclopentene-1,3-dione;Tetrachlorocyclopentene-2,4-dione