title: Crystal structure of 4-acetamido-benzoic acid monohydrate.
abstract: In the title compound, C9H9NO3·H2O, the plane of the acetamide group is oriented at 20.52 (8)° with respect to the benzene ring, whereas the plane of the carb-oxy-lic acid group is essentially coplanar with the benzene ring [maximum deviation = 0.033 (1) Å]. In the crystal, classical O-H⋯O and N-H⋯O hydrogen bonds and weak C-H⋯O hydrogen bonds link the organic mol-ecules and water mol-ecules of crystallization into a three-dimensional supra-molecular architecture.
authors.affiliation: College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, People's Republic of China.
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Cai
authors.affiliation: College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, People's Republic of China.
authors.forename: Shao-Ming
authors.initials: SM
authors.lastname: Chi
authors.affiliation: College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, People's Republic of China.
authors.forename: Jun-Feng
authors.initials: JF
authors.lastname: Kou
authors.affiliation: College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, People's Republic of China.
authors.forename: Feng-Yi
authors.initials: FY
authors.lastname: Liu
keywords: 4-acetamido­benzoic acid; crystal structure; hydrated carb­oxy­lic acid; hydrogen bonding