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The title compound, C36H34N4O4S2, is a thioglycoluril derivative, which bears two phenyl substituents on its convex face and two methoxy substituted o-xylylenes as sidewalls of the molecular clip. There is one half-molecule in the asymmetric unit: a crystallographic twofold axis generates the complete molecule. The non-planar seven-membered rings adopt chair conformations, while the two five-membered rings exhibit envelope conformations and make a dihedral angle of 68.46 (12)°. The O atoms of the methoxy groups are coplanar with the six-membered o-xylylene sidewalls.