5-[(8-Hydroxyquinolin-2-ylamino)-methylene]-2,2-dimethyl-1,3-dioxane-4,6-dione

\In the title compound, C16H14N2O5, the 1,3-dioxane-4,6-dione ring is in an envelope conformation. The C-N-C-C torsion angle between the nearly planar quinoline ring system carrying the OH group and the 1,3-dioxane-4,6-dione unit is -177.1 (1)degrees. The NH group has an intramolecular contact to a carbonyl O atom, forming a six-membered ring, and also an intermolecular contact to the carbonyl 0 atom. One intramolecular O-H center dot center dot center dot N and two intermolecular C-H center dot center dot center dot O hydrogen bonds are also observed. Two molecules are connected by these hydrogen bonds, forming layers.