The mol­ecule of the title compound, C9H9N3O2S, is built up from fused five- and six-membered rings connected to methyl­sulfanyl and nitro groups, respectively. The mean plane through the fused ring system is inclined slightly relative to the plane passing through the nitro group [dihedral angle = 3.6 (2)°]. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds and π–π inter­actions between imidazole rings [inter-centroid distance = 3.667 (3) Å], forming a three-dimensional network.

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