Crystal structure of 6,7-dihy­droxy-6,7-di­hydro-3H-imidazo[1,2-a]purin-9(5H)-one

The title purine derivative, C(7)H(7)N(5)O(3), is an adduct of guanine with glyoxal. In the mol­ecule, the di­hydro­imidazole ring adopts a twisted conformation on the C—C bond, and the two hydroxyl groups lie on opposite sides of the mean plane of the ring. In the crystal, the mol­ecules are linked by N—H⋯O, O—H⋯N and N—H⋯N hydrogen bonds forming a three-dimensional framework. The crystal packing is reinforced by C—H⋯O hydrogen bonds and by offset π–π stacking of the purine ring systems of inversion related mol­ecules [inter­centroid distance = 3.4839 (12) Å].