Acta Cryst. (2013). E69, o50 [ doi:10.1107/S1600536812049677 ]
Abstract: The asymmetric unit of the title compound, C13H11NO6, contains two molecules in both of which the six-membered 1,3-dioxane-4,6-dione ring shows a screw-boat conformation. The dihedral angles between the best planes through the six-membered rings are 47.8 (2) and 49.8 (2)°. In the crystal, C-HO interactions link the molecules, building a supramolecular sheet parallel to the c axis.
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