Acta Cryst. (2002). E58, o211-o214 [ doi:10.1107/S1600536802001174 ]
Abstract: In the title compound, 2C9H12NO3+·SO42-·H2O, the sulfate anion is linked to the tyrosinium residue 1 by a strong O-HO hydrogen bond, while tyrosinium residue 2 forms a relatively strong O-HO hydrogen bond with the terminal hydroxyl O atom, O, resulting in a hydrogen-bonded helical structure around the b axis. A zigzag (Z1) head-to-tail sequence is observed in residue 2. Ribbons of tyrosinium residues parallel to the a axis are interconnected by sulfate anions and disordered water molecules in a three-dimensional network. The disordered water molecule links the sulfate anion and tyrosinium residue as a chain running along the b axis.
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