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In the title compound, C8H6N2O3, the indol-2-one system is almost planar [maximum deviation = 0.010 (3) Å]. In the crystal structure, intermolecular N—H...O, O—H...N and O—H...O hydrogen bonds link the molecules into a three-dimensional network. π–π contacts between the indole ring systems [centroid–centroid distances = 3.494 (1), 3.731 (1) and 3.736 (1) Å] may further stabilize the structure.