(2E,25E)-11,14,17,33,36,39,42-Heptaoxapentacyclo[41.4.0.0 5,10.018,23.027,32]-heptatetraconta-1(43),2, 5(10),6,8,18,-20,22,25,27,29,31,44,46-tetradecaene-4,24-dione

The title compound, C40H40O9, is a product of the double crotonic condensation of bis(2-acetylphenoxy)-3-oxapentane with bis(2-formylphenoxy)-3,6-dioxaoctane. The title macromolecule includes the 31-crown-7-ether skeletal unit and adopts a saddle-like conformation. The two ethylene fragments have E configurations. The volume of the internal cavity of the macrocycle is approximately 125 Å3. In the crystal, the molecules are arranged at van der Waals distances.