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The title compound, C9H10N2O5, crystallizes with two crystallographically independent molecules in the asymmetric unit. In the crystal structure, the nitropyridone rings are connected by weak C-H...O interactions, forming sheet-like arrays, which are in turn linked by C-H...[pi] and [pi]-[pi] interactions between the nitropyridone rings on one side, and by C-H...O and van der Waals interactions between the ester groups on the other.
Acta crystallographica. Section E, Structure reports online
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