1,2,3,4,5,6,7,8,13,13,14,14-Dodeca­chloro-1,4,4a,4b,5,8,8a,12b-octa­hydro-1,4:5,8-dimethano­triphenyl­ene at 90 K

The previously reported room-temperature crystal structure [Jaud Baldy, Negrel, Poite & Chanon (1993). Z. Kristallogr. 204, 289–291] of the title compound, C₂₀H₈Cl₁₂, is monoclinic with Z′ = 1, whereas the 90 K structure reported herein is triclinic with Z′ = 2 and shows a 2% volume contraction. The crystallographically independent unit chosen consists of both enanti­omers (Λ and Δ) of this propeller-like mol­ecule. Both enanti­omers display quasi-twofold symmetry, with average bond-length/bond-angle deviations of 0.0018 (4) Å and 0.41 (2)° for Λ, and 0.0026 (4) Å and 0.50 (2)° for Δ.