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The title compound, 2C3H7N6+·C6H2N2O42−·4H2O or (tataH)2(pzdc)·4H2O, was synthesised by a reaction between pyrazine-2,3-dicarboxylic acid (H2pzdc) as a proton donor and 2,4,6-triamino-1,3,5-triazin (tata) as a proton acceptor. In the crystal structure, an extensive series of O—H...O, O—H...N, N—H...O and N—H...N hydrogen bonds generates a three-dimensional framework with the hydrogen bonding involving most donor and acceptor centers. π–π stacking inter­actions are also observed between adjacent triazine rings, with centroid–centroid distances of 3.4994 (8) and 3.5922 (7) Å.
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