3,4,5-trichlorocyclopent-3-ene-1,2-dione

1,2,3,4,7,7-hexachlorobicyclo[2.2.1]hept-2-en-5-one

1,2,3,4,5-pentachloro-5-fluorocyclopenta-1,3-diene

1,2,3,4-tetrachloro-5,5-difluoro-cyclopenta-1,3-diene

1,2,3,4,5-pentafluorocyclopenta-1,3-diene