title: 1H-Pyrrole-2-carboxylic acid.
abstract: In the title compound, C(5)H(5)NO(2), the pyrrole ring and its carboxyl substituent are close to coplanar, with a dihedral angle of 11.7 (3)° between the planes. In the crystal structure, adjacent mol-ecules are linked by pairs of O-H⋯O hydrogen bonds to form inversion dimers. Additional N-H⋯O hydrogen bonds link these dimers into chains extending along the a axis.
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou, Guangdong 510632, People's Republic of China.
authors.forename: Gui Hong
authors.initials: GH
authors.lastname: Tang
authors.forename: Dong Dong
authors.initials: DD
authors.lastname: Li
authors.forename: Gang
authors.initials: G
authors.lastname: Huang
authors.forename: Xing Yan
authors.initials: XY
authors.lastname: Xu
authors.forename: Xiang Chao
authors.initials: XC
authors.lastname: Zeng