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In the title compound, C8H6N4O3S, the dihedral angle between the pyrazine rings is 85.04 (1)°. In the crystal, molecules are arranged along the a axis and are linked by C—H...N hydrogen bonds and pyrazine–pyrazine π–π interactions [centroid–centroid distance = 3.800 (1) Å, forming an infinite chain array. The chains are connected by C—H...O(oxide) hydrogen bonds into layers lying parallel to the ab plane. Along the c axis, the layers are stacked and linked through C—H...O(sulfonyl) interactions, forming a three-dimensional network.