title: 2-(Carbazol-9-yl)acetic acid.
abstract: In the title compound, C(14)H(11)NO(2), the tricyclic aromatic ring system is essentially planar [maximum deviation = 0.025 (2) Å]. The dihedral angle between the two benzene rings is 2.8 (5)°, while the carboxyl group forms a dihedral angle of 88.5 (1)° with the pyrrole ring. Inter-molecular O-H⋯O hydrogen bonds may contribute to the overall stabilization of the crystal structure.
authors.affiliation: Jiangsu Institute of Nuclear Medicine, Wuxi 214063, People's Republic of China.
authors.forename: Min-Hao
authors.initials: MH
authors.lastname: Xie
authors.forename: Pei
authors.initials: P
authors.lastname: Zou
authors.forename: Yong-Jun
authors.initials: YJ
authors.lastname: He
authors.forename: Ya-Ling
authors.initials: YL
authors.lastname: Liu
authors.forename: Biao
authors.initials: B
authors.lastname: Huang