3-(Phenyl­carbamoyl)acrylic acid

In the title compound, C₁₀H₉NO₃, 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 intra­molecular O—H...O hydrogen bond closes an S(7) ring. In the crystal, N—H...O hydrogen bonds link the mol­ecules into C(7) chains propagating in [101]. The packing is consolidated by C—H...O inter­actions, generating sheets aligned at an angle of ca 60° with the bc plane.