2,3,4,4-tetrachloro-cyclobut-2-en-1-one, Tetrachlorocyclobutenone, Perchloro-2-cyclobutene-1-one, Tetrachloro-2-cyclobutene-1-one, Perchlorobutenone, Tetrachlorcyclobutenon, Perchlorcyclobutenon, 2-CYCLOBUTEN-1-ONE,2,3,4,4-TETRACHLORO, EINECS 221-704-6, Perchlorocyclobut-2-enone, 2,3,4,4-tetrachloro-2-cyclobuten-1-one, Perchloro-2-cyclobuten-1-one, 2-Cyclobuten-1-one, 2,3,4,4-tetrachloro-, Tetrachlorocyclobut-2-enone, Perchlorocyclobutenone