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The title compound, C 13 H 12 N 4 O 3 , is an imidazole derivative featuring an annealed purine ring system. The benzimidazole-inspired moiety is essentially planar (r.m.s. of all fitted non-H atoms = 0.0205 Å). An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds are observed, which connect the mol­ecules into chains along [110]. The shortest centroid–centroid distance between two aromatic systems is 3.7771 (11) Å.

8-(2-Hydroxyphenyl)-1,3-dimethyl-1H-purine-2,6(3H,7H)-dione