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In the title compound, C7H9N5O2S, the pyrazolo[4,3-e][1,2,4]triazine fused-ring system is essentially planar [maximum deviation = 0.0420 (3) Å]. In the crystal, molecules related by twofold axes are linked into a molecular net via intermolecular C—H...O and C—H...N hydrogen bonds. π–π interactions are observed between the triazine and pyrazole rings of molecules related by the the twofold axis and inversion symmetry with centroid–centroid distances of 3.778 (3) and 3.416 (3) Å, respectively.