In the title compound, C(14)H(11)NO(2), the tricyclic aromatic ring system is essentially planar [maximum deviation = 0.025 (2) Å]. The dihedral angle between the two benzene rings is 2.8 (5)°, while the carboxyl group forms a dihedral angle of 88.5 (1)° with the pyrrole ring. Inter-molecular O-H⋯O hydrogen bonds may contribute to the overall stabilization of the crystal structure.