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The title complex, [Mg(C7H7N4O2)2(H2O)4], lies across an inversion centre and the MgII atom is coordinated in a slightly distorted octahedral environment by four aqua ligands in the equatorial sites and two 1,3-dimethyl-2,6-dioxo-3,7-dihydro-1H-purin-9-ide ligands, through imidazole ring N atoms, in the axial sites. An intramolecular O—H...O hydrogen bond forms an S(7) graph-set motif. In the crystal, O—H...O and O—H...N hydrogen bonds link complex molecules forming a three-dimensional network incorporating R42(8) and R22(18) graph-set motifs.