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The title compound, C9H8N3O+·Cl−, was isolated from a liquid culture of streptomyces sp. In the cation, the ring system makes a dihedral angle of 0.2 (2)° with the amide group. The protonation creating the cation occurs at ome of the N atoms in the quinoxaline ring system. In the crystal, the ions are linked through N—H...O and N—H...Cl hydrogen bonds, forming a two-dimensional network parallel to (10overline{3}).