The mol-ecule of the title compound, C(12)H(16)N(2)O(4), is centrosymmetric and the amide group is twisted relative to the benzene ring by 14.40 (13)°. The mol-ecules are hydrogen bonded into a three-dimensional framework, with the hydr-oxy O atoms acting as acceptors in N-H⋯O hydrogen bonds and as donors in O-H⋯O=C inter-actions.