In the mol-ecule of the title compound, C(10)H(10)N(2)O(5), intra-molecular C-H⋯O inter-actions result in the formation of a five- and a six-membered ring. The five-membered ring is planar and is oriented at a dihedral angle of 0.34 (3)° with respect to the plane of the aromatic ring, while the six-membered ring has a twist conformation. In the crystal structure, inter-molecular C-H⋯O inter-actions link the mol-ecules into chains.