title: 6-Bromo-1H-indole-3-carb-oxy-lic acid.
abstract: In the title mol-ecule, C(9)H(6)BrNO(2), the dihedral angle between the -COOH group and the ring system is 6 (4)°. In the crystal, pairs of O-H⋯O hydrogen bonds link the mol-ecules into inversion dimers and these dimers are connected via N-H⋯O hydrogen bonds to form layers parallel to the (-101) plane.
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189,  People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang