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In the title compound, C 13 H 13 NO 4 , the bicyclic quinolone fragment and the ester group are approximately orthogonal, making a dihedral angle of 83.3 (2)° and an intramolecular C—H⋯O interaction occurs. In the crystal, inter­molecular O—H⋯O hydrogen bonding generates a zigzag chain along the  c  axis.

Methyl 2-(4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinolin-3-yl)acetate