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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.

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