Acta Cryst. (2012). E68, o3472 [ doi:10.1107/S1600536812044297 ]
Abstract: The title compound [systematic name: 5-(trifluoromethoxy)-1H-indole-2,3-dione], C9H4F3NO3, crystallized with two molecules in the asymmetric unit. Intermolecular N-HO hydrogen bonds link the molecules to form layers parallel to the ab plane. In addition, - stacking interactions are observed with a centroid-centroid distance of 3.721 (1) Å. The near planarity of the two isatin ring systems is illustrated by by the maximum deviations of 0.023 (1) and 0.025 (1) Å for the N atom in each case.
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