1,2,3,4,5,6,7,8,13,13,14,14-Dodeca-chloro-1,4,4a,4b,5,8,8a,12b-octa-hydro-1,4:5,8-dimethano-triphenyl-ene 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, C(20)H(8)Cl(12), 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 enanti-omers (Λ and Δ) of this propeller-like mol-ecule. Both enanti-omers display quasi-twofold symmetry, with average bond-length/bond-angle deviations of 0.0018†(4)†à and 0.41†(2)° for Λ, and 0.0026†(4)†à and 0.50†(2)° for Δ.