Acta Cryst. (2009). E65, o2328 [ doi:10.1107/S1600536809034321 ]
Abstract: 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-HO, O-HN and O-HO hydrogen bonds link the molecules into a three-dimensional network. - 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.
Online 5 September 2009
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