title: 4-(2-Hydroxy-ethyl)anilinium 3-carb-oxy-4-hydroxy-benzene-sulfonate monohydrate.
abstract: In the structure of the title compound, C(8)H(12)NO(+)·C(7)H(5)O(6)S(-)·H(2)O, isolated from the reaction of 2-(4-amino-phen-yl)ethanol with 5-sulfosalicylic acid, the cations form head-to-tail hydrogen-bonded chains through C(1) (1)(9) anilinium N(+)-H⋯O(hydrox-yl) inter-actions while the anions also form parallel but C(1) (1)(8)-linked chains through carboxylic acid O-H⋯O(sulfonate) inter-actions. These chains inter-associate through a number of N(+)-H⋯O and O-H⋯O bridging inter-actions, giving a two-dimensional array in the ab plane.
authors.forename: Graham
authors.initials: G
authors.lastname: Smith
authors.forename: Urs D
authors.initials: UD
authors.lastname: Wermuth