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

There are two unique mol­ecules in the asymmetric unit of the title compound, C(17)H(15)NO(4), which are linked into chains via inter­molecular N—H⋯O and C—H⋯O inter­actions; the chains are linked via weak C—H⋯O inter­actions, forming a parallel sheet structure. The molecule is approximately planar, with dihedral angles of 19.91 (4) and 11.06 (4)° between the naphthyl ring and the amino­methyl­ene group, and between the amino­methyl­ene unit and the planar part of the dioxane ring, respectively. The dioxane ring adopts a half-boat conformation, with the C atom between the dioxane O atoms 0.595 (8) Å out of the plane through the remaining atoms. The mol­ecule has an intra­molecular N—H⋯O hydrogen bond which stabilizes the planar conformation.