Acta Cryst. (2004). E60, o2093-o2095 [ doi:10.1107/S1600536804026108 ]
Abstract: In the title compound, C5H14N2O22+·SO42-·H2O, the ornithinium cation forms a strong O-HO hydrogen bond with the sulfate anion. One backbone conformation angle is in an eclipsed conformation, while the other two are in a trans-trans staggered conformation. All the amino and carboxylate groups and the sulfate anions are involved in hydrogen bonding. The amino groups are also involved in a three-centred hydrogen bond with the O atoms of the sulfate anion.
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