organic compounds
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In the title compound, C15H13N3O4, the pyridine and benzene rings are nearly perpendicular [dihedral angle = 84.24 (5)°]. In the crystal structure, classical O—HN hydrogen bonding between the OH group of the carboxyl unit and a neighbouring pyridine ring N atom and N—HO hydrogen bonding between the imine NH group and a neighbouring O atom of an acyl unit, together with complementary non-classical C—HO hydrogen bonds between carboxyl O atoms and neighbouring CH groups, link the molecules into a three-dimensional system.