Crystal structure and Hirshfeld surface analysis of 3,3'-[ethane-1,2-diylbis(-oxy)]bis-(5,5-di-methyl-cyclo-hex-2-en-1-one) including an unknown solvate.

The title mol-ecule, C 18 H 26 O 4 , consists of two symmetrical halves related by the inversion centre at the mid-point of the central -C-C- bond. The hexene ring adopts an envelope conformation. In the crystal, the mol-ecules are connected into dimers by C-H⋯O hydrogen bonds with R 2 2 (8) ring motifs, forming zigzag ribbons along the b -axis direction. According to a Hirshfeld surface analysis, H⋯H (68.2%) and O⋯H/H⋯O (25.9%) inter-actions are the most significant contributors to the crystal packing. The contribution of some disordered solvent to the scattering was removed using the SQUEEZE routine [Spek (2015 ▸). Acta Cryst . C 71 , 9-18] in PLATON . The solvent contribution was not included in the reported mol-ecular weight and density.