Bis[mu-6-amino-3-methyl-5-nitrosopyrimidine-2,4(1H,3H)-dionato-kappa3O4,N5:O5]-di-micro-aqua-bis[diaqua[6-amino-3-methyl-5-nitrosopyrimidine-2,4(1H,3H)-dionato-kappa2N1,O2]strontium(II)]: centrosymmetric dimers containing nine-coordinate Sr, linked by multiple hydrogen bonds into a three-dimensional framework.

The title complex, [Sr(2)(C(5)H(5)N(4)O(3))(4)(H(2)O)(6)], forms centrosymmetric dimers in which one water ligand bridges two Sr centres and in which one of the anionic ligands is bidentate and bonded to just one Sr atom, and the other is tridentate and bridges the two Sr centres within the dimer. The dimeric units are linked by an extensive series of O-H...O, O-H...N and N-H...O hydrogen bonds to form a complex three-dimensional framework.