| Summary: | In the title zwitterion, C15H13NO4, obtained from the condensation of 5-aminosalicylic acid and 4-methoxybenzaldehyde, the 4-hydoxyanilinic group of the 5-aminosalicylic acid moiety and the 4-methoxybenzaldehyde moiety are twisted with respect to one another, making a dihedral angle of 10.37 (7)°. The carboxylate group makes a dihedral angle of 5.7 (2)° with the parent 4-hydoxyanilinic group. An intramolecular O—H...O hydrogen bond forms an S(6) ring motif. In the crystal, intermolecular C—H...O and N—H...O hydrogen bonds with R21(7) ring motifs link the molecules into infinite chains extending along the c axis. The occurence of slipped π–π stacking between symmetry-related aromatic rings reinforces the packing.
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