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In the title compound, [Mg(C6H2N2O4)(H2O)4]·H2O, the MgII ion is coordinated by a fully deprotonated pyrimidine-4,6-dicarboxyl­ate mol­ecule, via a ring N and a carboxyl­ate O atom, and by four water O atoms at the apices of a slightly distorted octa­hedron. In the crystal, mol­ecules are linked by O—H...O and O—H...N hydrogen bonds, forming a three-dimensional network.

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The crystal structure of the title compound, C5H4N2O2, is built of acid mol­ecules located on a mirror plane. They form sheets stacked along the b-axis direction. The mol­ecules inter­act via O—H...N hydrogen bonds, forming [001] chains, and weak van der Waals inter­actions.
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