(Z)-Ethyl 2-oxo-3-(1,2-dihydroquinolin-2-yl­idene)propano­ate

Both independent mol­ecules in the asymmetric unit of the tautomeric title compound, C(14)H(13)NO(3), a synthetic product obtained from 2-lithio­methyl­quinoline and diethyl oxalate, crystallize in the enaminone form with a Z configuration around the double bond. Intra­molecular N—H⋯O hydrogen bonds occur, generating an S(6) graph-set motif. In the crystal, weak inter­molecular C—H⋯O and π–π stacking inter­actions [centroid–centroid distances = 3.7020 (14)–3.7429 (13)Å] define a three-dimensional supra­molecular network.