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The cation of the title salt, C7H6NO4+.F−, lies on a twofold rotation axis that passes through the N and 4-C atoms of the pyridine ring; the carboxylic acid substituent features unambiguous carbon–oxygen single and double bonds. The fluoride ion is a hydrogen-bond acceptor to two hydroxy and one amino groups, these O—H...F and N—H...F hydrogen bonds leading to the formation of a layer structure parallel to the ab plane. The F atom lies on a position of 2 site symmetry.