Molecules of the title compound, C(5)H(6)N(4)O(3), are linked into a single three-dimensional framework by a two-centre N-H.O hydrogen bond [H.O = 1.92 A, N.O = 2.785 (2) A and N-H.O = 168 degrees ], a two-centre N-H.H hydrogen bond [H.N = 2.19 A, N.N = 3.017 (2) A and N-H.N = 157 degrees ] and the intermolecular component of an effectively planar three-centre N-H.(O)(2) hydrogen bond [H.O = 2.03 and 2.31 A, N.O = 2.645 (2) and 2.957 (2) A, N-H.O = 126 and 130 degrees, and O.H.O = 101 degrees ].
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