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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.

In the title compound, C20H24N2O5, the dihedral angle between the two roughly planar salicyl­amide fragments [r.m.s. deviations = 0.043 (2) and 0.149 (2) Å] is 25.50 (5)°. The mol­ecular conformation is stabilized by intra­molecular O—H⋯O hydrogen bonds involving phenol –OH groups and amide O atoms. Inter­molecular hy­droxy­meth­yl–amide O—H⋯O and amine–hy­droxy­methyl N—H⋯O hydrogen bonds form infinite chains along the b axis. These chains are further inter­linked by amine–amide N—H⋯O and phenol–phenol O—H⋯O inter­actions, thus giving layers parallel to (001).

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