2-Oxo-1,2-dihydropyridine-6-carboxylic Acid

The molecular structure of the title compound, C₆H₅NO₃, clearly indicates the keto–enol tautomerism of the CONH moiety, although the keto form is more preferable than the enol form. Two molecules are connected by two N—H...O hydrogen bonds around an inversion center to form a dimer, and the dimers are linked in a planar fashion by O—H...O hydrogen bonds to form a sheet.

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