organic compounds
The title compound, C10H12O5N2, crystallizes with two independent molecules in the asymmetric unit. The molecules in the crystal structure are arranged into one-dimensional substructural ribbon motifs stabilized by a combination of two O—HO and three N—HO intermolecular hydrogen bonds, and also augmented by short C=OC=O carbonyl–carbonyl interactions. Two intermolecular C—HO short contacts between adjacent ribbons generate complex two-dimensional sheets on the ab plane. Adjacent sheets are linked via C—Hπ(arene) interactions, resulting in a complex three-dimensional framework.