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The title compound, C 13 H 15 NO 3 , was synthesized by the Aldol reaction of isatin and 3-methyl­butan-2-one refluxing in methanol catalyzed by dimethyl­amine. The packing of the mol­ecules in the crystal structure features inter­molecular N—H⋯O and O—H⋯O hydrogen bonds.

3-Hydroxy-3-[(2-methylpropanoyl)methyl]indolin-2-one