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In the title compound, [Mn(C5H2N2O4)(H2O)2]n, the MnII ion has a distorted octa­hedral geometry and the 4-oxido-2-oxo-1,2-dihydro­pyrimidine-5-carboxyl­ate (Hiso2−) anion acts as a μ34-bridging ligand. Two oxo O atoms from different Hiso2− ligands bridge two MnII ions, forming centrosymmetric dinuclear building blocks. Each dinuclear building block inter­acts with another four by the coordination of the oxide groups and carboxyl­ate O atoms, producing a two-dimensional framework in the ab plane. Hydrogen bonds further extend the two-dimensional sheets into a three-dimensional supra­molecular framework.
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