title: 3-(Phenyl-carbamoyl)acrylic acid.
abstract: In the title compound, C(10)H(9)NO(3), the dihedral angle between the phenyl ring and the amide group is 10.8 (2)°. The C=O and O-H bonds of the carboxyl group adopt an anti orientation and an intra-molecular O-H⋯O hydrogen bond closes an S(7) ring. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into C(7) chains propagating in [101]. The packing is consolidated by C-H⋯O inter-actions, generating sheets aligned at an angle of ca 60° with the bc plane.
authors.affiliation: Tianmu College of ZheJiang A & F University, Lin'An 311300,  People's Republic of China.
authors.forename: Shouwen
authors.initials: S
authors.lastname: Jin
authors.forename: Yanfei
authors.initials: Y
authors.lastname: Huang
authors.forename: Shuaishuai
authors.initials: S
authors.lastname: Wei
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Yingping
authors.initials: Y
authors.lastname: Zhou