1,3-Cyclopentadiene, 1,2,3,4-tetrachloro-5-(2,3,4,5-tetrachloro-2,4-cyclopentadien-1-ylidene)- 6298-65-3 Bi-2,4-cyclopentadien-1-ylidene, 2,2',3,3',4,4',5,5'-octachloro- NSC37653 Octachlorofulvalene Octachloropentafulvalene Perchlorofulvalene