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ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, vol.64, 2008 (SCI-Expanded)
In the molecule of the title compound, C15H13NO3, the phthalide ring system is virtually planar, with a dihedral angle of 1.98 (3)degrees between the fused five- and six-membered rings. The substituted aromatic ring is oriented at a dihedral angle of 57.50 (3)degrees with respect to the phthalide ring system. In the crystal structure, intermolecular O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds link the molecules, forming a three-dimensional network.