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In the title compound, C8H10N4O2, all non-H atoms are nearly coplanar [maximum deviation 0.1256 (16) Å for the methyl C furthest from the ring]. Intermolecular O—H...N hydrogen bonds link adjacent molecules into a one-dimensional zigzag chain along the c axis. There is also a weak π–π stacking interaction between neighbouring pyrazine rings, with a centroid–centroid distance of 4.0432 (15) Å.