In the title compound, C(15)H(13)N(3)O(4), the pyridine and benzene rings are nearly coplanar [dihedral angle = 4.92 (12)°]. The maximum deviation from the best least-squares plane calculated for the main mol-ecular skeleton is 0.1722 (1) Å for the carbonyl O atom. In the crystal, inter-molecular O-H⋯O hydrogen bonds connect the mol-ecules into a chain, while π-π stacking inter-actions between ...
