The title compound, C4H5FN3O+·C7H5O3−, exists as a hydrogen-bonded heterodimer of 5-fluorocytosinium and salicylate ions which are connected through a pair of nearly parallel specific N—H⋯O hydrogen bonds. The heterodimer self-assembles via intermolecular N—H⋯O hydrogen bonds to form linear, as well as helical, hydrogen-bonded supramolecular chains that are interwoven into a three-dimensional network structure.
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Prabakaran et al. (2001) studied this question.