title: 5-Fluoro-1H-indole-3-carb-oxy-lic acid.
abstract: In the title compound, C(9)H(6)FNO(2), the carboxyl group is twisted slightly away from the indole-ring plane [dihedral angle = 7.39 (10)°]. In the crystal, carboxyl inversion dimers linked by pairs of O-H⋯O hydrogen bonds generate R(2) (2)(8) loops and N-H⋯O hydrogen bonds connect the dimers into (10[Formula: see text]) sheets.
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096,  People's Republic of China.
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Lu
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Zou
authors.forename: Yang-Hui
authors.initials: YH
authors.lastname: Luo