The asymmetric unit of the title compound, C15H13N3O5, contains two independent molecules. Each molecule displays an E configuration with respect to its C=N double bond. The dihedral angles between the two benzene rings are 11.1 (2) and 10.9 (2)° in the two molecules. In the crystal structure, molecules are linked through intermolecular O—H
O hydrogen bonds, forming chains running along the a axis.
O hydrogen bonds, forming chains running along the a axis.


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