In the mol-ecule of the title compound, C(8)H(7)NO(5), the acetate group is oriented with respect to the aromatic ring at a dihedral angle of 85.30 (3)°. An intra-molecular O-H⋯O hydrogen bond results in the formation of a non-planar six-membered ring, adopting an envelope conformation. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules.