Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.004 Å; R factor = 0.053; wR factor = 0.150; data-to-parameter ratio = 14.2.The asymmetric unit of the title compound, C 20 H 28 N 2 O 6 S 2 , contains one half-molecule, related to the other half by a twofold rotation axis. The two aromatic rings of the molecule make a dihedral angle of 50.91 (7) . The O-CH 2 -CH 2 -O and N-CH 2 -CH 2 -O fragments both adopt gauche conformations, with torsion angles of 76.0 (4) and 70.4 (3) , respectively. In the crystal, adjacent molecules are linked through N-HÁ Á ÁO hydrogen bonds into chains along the aaxis direction. The chains are further connected via C-HÁ Á ÁO interactions into a two-dimensional supramolecular network in the ac plane.
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