In the title molecule, C6H6N4S2, a twofold rotation axis passes through the mid-point of the S—S bond. The C—S—S—C torsion angle is 83.62 (17)°. π–π stacking between imidazole rings of adjacent molecules is observed in the crystal structure, the centroid–centroid distance being 3.447 (2) Å. Intermolecular N—H⋯S hydrogen bonding results in the formation of a linear chain in the c-axis direction.
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