Abstract
The asymmetric unit of the title compound, C(9)H(11)N(3)O(3), consists of two crystallographically independent mol-ecules. Both mol-ecules are almost planar, with r.m.s. deviations of 0.107 and 0.099 Å. In the crystal, the two independent mol-ecules form a dimer with an R(2) (2)(8) ring motif via N-H⋯O hydrogen bonds. The dimers are further linked into a three-dimensional network by O-H⋯O and N-H⋯O hydrogen bonds.