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The crystal structure of the title compound, C8H9NO3, features centrosymmetric dimers with two amide groups inter­connected by a pair of almost linear N—H...O hydrogen bonds. Through inter­molecular O—H...O inter­actions between phenolic hy­droxy groups and carbonyl O atoms, these dimers are assembled into undulating hydrogen-bonded layers parallel to the [101] plane. Additionally, the anti-H(—N) atom of the primary amide group forms an intra­molecular hydrogen bond to the O atom of the meth­oxy group. The amide group froms a dihedral angle of 12.6 (1)° with the phenyl ring.
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