2,2-Dimethyl-5-(2-nitrobenzylidene)-1,3-dioxane-4,6-dione

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—H...O interactions link the molecules, building a supramolecular sheet parallel to the c axis.