Acta Cryst. (2013). E69, o284 [ doi:10.1107/S1600536812051872 ]
Abstract: In the title compound, C13H9NO6, the coumarin system has the benzene ring aligned at 0.61 (18)° with respect to the pyrone ring. An intramolecular O-HO hydrogen bond stabilizes the molecular conformation and a C-HO contact also occurs. In the crystal, weak C-HO interactions link the molecules, forming inversion dimers.
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