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The title compounds, both C(13)H(11)NO(3), exist as the keto-amine tautomers, and the formal hydroxyl H atoms, which display strong intramolecular hydrogen bonds, are located on the N atoms. This is a verification of the preference for the keto-amine tautomeric form in the solid state. The 2-hydroxy isomer has two independent molecules, with the molecules linked by intramolecular N-H.O and O-H.O and intermolecular O-H.O hydrogen bonds into three-dimensional networks.

The title compound, C13H11NO3, adopts the keto–amine tautomeric form, with the H atom located on N rather than on O. This H atom is involved in a strong intra­molecular hydrogen bond. There are two independent molecules in the asymmetric unit. The mol­ecules are linked by intra­molecular N—H·O and O—H·O and inter­molecular O—H·O hydrogen bonds into a three‐dimensional network.

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Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.006 Å R factor = 0.035 wR factor = 0.069 Data-to-parameter ratio = 14.0For details of how these key indicators were automatically derived from the article, see