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In the title complex, [Mn(C8H9N2O4)2(H2O)2]·3.5H2O, the MnII cation is six-coordinated by two N,O-bidentate H2pimda− ligands (H2pimda− = 5-carboxy-2-propyl-1H-imidazole-4-carboxylate) and two water molecules in a distorted octahedral environment. The complete solid-state structure can be described as a three-dimensional supramolecular framework stabilized by a wide range of O—H...O and N—H...O hydrogen bonds. The propyl groups of H2pimda− are disordered over two sets of sites with refined occupancies of 0.759 (5):0.241 (5) and 0.545 (7):0.455 (7).