Abstract
The title compound, C14H16N2O6, crystallizes in the monoclinic space group, C2/c. C2 symmetry is imposed on the molecule. The ethyl oxamate groups are twisted out of the aromatic ring plane by 34.53 (6)° and both carbonyl groups are antiperiplanar. The intramolecular hydrogen-bonding pattern is depicted by a soft C—H⋯O/O′ three-centered hydrogen bond, and N—H⋯O and C—H⋯O hydrogen-bonding interactions which form an S(5)S(5)S(6)S(6)′S(5)′S(5)′ motif. The molecules are linked into C(3) and C(4) chain motifs, forming supramolecular layers in the ac plane.
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