Molecules of the title compound, C(7)H(7)N(3)O(2), are linked by two N-H...O hydrogen bonds [H...O = 2.42 and 2.47 A, N...O = 3.191 (4) and 3.245 (4) A, and N-H...O = 150 and 151 degrees ] into sheets built from a single type of R(4)(4)(26) ring.
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