In the mol-ecule of the title compound, C(16)H(15)NO(5), the aromatic rings are oriented at a dihedral angle of 74.89 (3)°. Intra-molecular C-H⋯O inter-actions result in the formation of a seven-membered ring. In the crystal structure, weak inter-molecular C-H⋯O inter-actions link the mol-ecules into chains along the b axis.