2,2-Dimethyl-5-[(3-nitro­anilino)methyl­ene]-1,3-dioxane-4,6-dione

The benzene ring of the title compound, C(13)H(12)N(2)O(6), is twisted away from the planes of the amino­methyl­ene unit and the dioxane ring by 30.13 (4) and 35.89 (4)°, respectively. The dioxane ring exhibits a half-boat conformation, in which the C atom between the dioxane O atoms is 0.553 (8) Å out-of-plane. An intra­molecular N—H⋯O hydrogen bond stabilizes the conformation of the dioxane ring with the amino­methyl­ene group [the dihedral angle between the mean planes of the dioxane ring and the amino­methyl­ene group is 11.61 (4)°]. In the crystal, a three-dimensional framework is built via weak inter­molecular N—H⋯O and C—H⋯O inter­actions.