3-(9H-Carbazol-9-yl)propanoic acid

The title compound, C15H13NO2, crystallizes with two molecules (A and B) in the asymmetric unit. The carbazole ring systems of both molecules are close to planar (r.m.s deviations = 0.035 and 0.053 Å). In the crystal, A+A and B+B inversion dimers linked by pairs of O—H...O hydrogen bonds generate R22(8) loops and weak C—H...π interactions link the dimers into a three-dimensional network.