The title compound, C10H13NO4, is essentially planar, with an r.m.s. deviation of 0.049 Å. An intra-molecular C-H⋯O hydrogen bond occurs and the amino group forms an intra-molecular N-H⋯Oester hydrogen bond; the other H atom forms an inter-molecular N-H⋯Ocarbon-yl hydrogen bond, leading to the formation of a helical chain that runs along the b-axis direction.