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Molecules of the title compound, C20H28O4S2, the first compound with a tetraoxacyclohexacosane ring to be structurally characterized, lie on crystallographic centres of inversion, but have approximate C2h molecular symmetry. The parallel thiophene rings are almost exactly planar; the overall conformation of the molecule is chair-like. The molecules have voids that could, in principle, accommodate small guest molecules, although in the crystal structure access to these voids is blocked by neighbouring molecules.