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The title compound, C 18 H 13 Cl 11 , is an undecachlorinated commercial flame retardant. The asymmetric unit contains two independent half-mol­ecules. The complete mol­ecules are generated by crystallographic inversion symmetry, causing the terminal H atoms and one of the Cl atoms to be disordered equally over two sites in each mol­ecule. The central eight-membered rings are in chair-type conformations. In the crystal structure, there is a single weak inter­molecular C—H⋯Cl hydrogen bond.

acta crystallographica. section e

(1R,2R,5R,6S,9R,10S,13S,14S,18R)-1,6,7,8,9,14,15,16,17,17,18-Undecachloropentacyclo[12.2.1.16,9.02,13.05,10]octadeca-7,15-diene