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In the title compound, C 7 H 9 N 5 O 2 S, 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.

1,3-Dimethyl-5-methylsulfonyl-1H-pyrazolo[4,3-e][1,2,4]triazine