Bis(melaminium) succinate succinic acid monosolvate dihydrate

The asymmetric unit of the solvated title salt, 2C3H7N6+·C4H4O42 ·C4H6O4·2H2O, contains one essentially planar melaminium (2,4,6-triamino-1,3,5-triazin-1-ium) cation (r.m.s. deviation of the non-H atoms = 0.0097 ), one-half of a succinate anion, one-half of a succinic acid solvent molecule and one water molecule of crystallization; full molecules are generated by inversion symmetry. Supramolecular layers parallel to (12-1) are formed through extensive intermolecular hydrogen bonding of the types O—H...O, N—H...N and N—H...O between the components.