Acta Cryst. (2012). E68, o146 [ doi:10.1107/S1600536811051865 ]
Abstract: In the title compound, C11H9NO4, the carboxyl group bonded to the six-membered ring lies close to the plane of the 1H-indole ring system [dihedral angle = 13.13 (9)°], whereas the carboxylic acid group linked to the five-membered ring by a methylene bridge is close to perpendicular [78.85 (9)°]. In the crystal, O-HO and N-HO hydrogen bonds link the molecules, generating (110) sheets.
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