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The title compound, C24H36, displays crystallographic inversion symmetry, but the actual symmetry is close to
. The structure is closely similar to (but not isostructural with) the analogous hexamethyl derivative [Marsh & Dunitz (1975). Helv. Chim. Acta, 58, 707-712]. The ring adopts a chair conformation with absolute torsion angles 45.4-45.8 (4)°. Ring bond lengths are 1.480 (4)-1.500 (4) Å and ring bond angles are 113.9 (3)-114.8 (3)°.
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