The title compound, C(15)H(11)FO(2), is an important inter-mediate in the synthesis of side-chain ligands for polymeric liquid crystals. The vinyl group is almost coplanar with both the aromatic rings. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonding.

In the title compound, C(14)H(13)NO(4)S, the dihedral angle between the aromatic rings is 35.47 (10)°. In the crystal, adjacent mol-ecules are connected by pairs of O-H⋯O hydrogen bonds, forming head-to-head centrosymmetric dimers typical for carb-oxy-lic acids. Adjacent dimers are further linked through C-H⋯O inter-actions on one side and N-H⋯O inter-actions on the other, generating [010] chains.