The title compound, C(4)H(14)N(2)O(2+) x HPO(4)(2-) x H(2)O, contains alternating interleaved layers of hydrogenphosphate and N-(2-hydroxyethyl)ethylenediammonium moieties. The water molecules are associated with channel-like voids in the structure and a network of hydrogen bonds stabilizes the crystal packing.
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