| Summary: | In the title compound, C13H13NO4, the asymmetric unit contains four independent molecules, each exhibiting an intramolecular N—H⋯O hydrogen bond. The ethyl group in one of the four molecules is disordered, with a refined occupancy ratio of 0.295 (16):0.705 (16). A face-to-face stacking interaction is found between the benzene rings of the quinoline units of two of the molecules [centroid–centroid distance = 3.541 (2) Å], which are sandwiched by the other two molecules through N—H⋯O hydrogen bonding. In the crystal, the sandwiched molecules are assembled via stacking interactions along the b-axis direction with their translation-symmetry equivalents [centroid–centroid distance = 3.529 (2) Å], and are further linked through N—H⋯O hydrogen bonding. The other two molecules are linked via stacking interactions with their inversion-symmetry equivalents [centroid–centroid distances = 3.512 (3) and 3.716 (4) Å] and via N—H⋯O hydrogen bonding.
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