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The title compound, C24H20O10, is centrosymmetric about the central C=C bond, indicating that the mol­ecule adopts a trans configuration and that the aromatic rings are parallel to each other. The crystal structure is stabilized by inter­molecular C—H...O inter­actions.

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The title compound, C26H30O10, is the meso isomer of a 2,3-disubstituted succinic acid derivative and has inversion symmetry. The crystal structure is stabilized by inter­molecular C—H...π and π–π stacking inter­actions.

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The mol­ecule of the title compound, C22H30O8, contains a crystallographic inversion centre located at the middle of the benzene ring.

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The title compound, C20H32N6O6, is a glycoluril derivative. The mol­ecule is built up from four fused rings, namely two nearly planar imidazole five-membered rings and two non-planar triazine six-membered rings. In the five-membered imidazole rings, the N—Ccarbon­yl bond distances are much shorter than the other N—C distances, indicating π–π conjugation within the nearly planar ring. Both six-membered rings display chair conformations.
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