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In the molecule of the title compound, C14H11NO3, the naphthalimide ring system is nearly planar (r.m.s. deviation 0.0139 Å). In the crystal structure, intermolecular O—H...O hydrogen bonds link the molecules into centrosymmetric dimers forming R22(14) ring motifs. π–π contacts between the naphthalimide rings [centroid–centroid distances = 3.648 (3), 3.783 (3), 3.635 (3), 3.722 (3) and 3.755 (3) Å] may further stabilize the structure.