In the title compound, C15H14N2O4, the N=C double bond has an E configuration. The two benzene rings make a dihedral angle of 28.59 (6)°. In the crystal, molecules are linked into a three-dimensional network by intermolecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds and stabilized by weak C—H⋯π interactions.
Die Oxidation von Visnagin bzw. Khellin mit alkalischem Wasserstoffperoxid liefert 4‐Methoxy‐ (I) bzw. 4,7 ‐Dimethoxy‐6‐hydroxy‐benzofuran‐S‐carbon= 154 säure (II), die auf den im Formelschema angegebenen Wegen in die 4‐Methoxy‐ (V) bzw. 4,7‐Dimethoxybenzofuran‐5‐carboxamido‐6‐O‐essigsäure (VI) übergeführt werden.
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