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In the title compound, C2H10N22+·2C7H5O4−·H2O, the cation lies on a centre of symmetry. The crystal structure is stabilized by various intermolecular O—H...O and N—H...O hydrogen bonds, and by weak π–π stacking interactions with centroid–centroid distances between symmetry-related benzene rings ranging from 3.5249 (13) to 3.7566 (14) Å.