[N-(6-amino-3,4-dihydro-3-methyl-5-nitroso-4-oxopyrimidin-2-yl)-glycylglycinato]aquapotassium, a three-dimensional coordination polymer

In the title compound, polymeric potassium N-(6-amino-3,4-dihydro-3-methyl- 5-nitroso-4-oxopyrimidin-2-yl)glycylgly- cinate hydrate, (K+.C9H11N6O5-.H2O )(n), the hexacoordinate K+ cation is linked to five different anions as we ll as to the water molecule, with K-O distances in the range 2.617 (2)- 2.8 50 (2) Angstrom. Four of the O atoms in each anion coordinate to K centres, one of them acting as a bridging ligand, leading to the formation of nearl y square centrosymmetric K2O2 rings. The structure is analysed in terms of (010) metal-ligand sheets linked by [010] chains of fused rings.