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In the title compound, C 13 H 13 NO 4 , the dihedral angle between the nine-membered phthalimino ring system and the carb­oxy­lic acid group is 67.15 (9)°. An intra­molecular C—H⋯O close contact, which forms an  S (6) ring, may help to establish the mol­ecular conformation. In the crystal, mol­ecules are linked by O—H⋯O hydrogen bonds, thereby forming  C (7) chains propagating in [010].

(2R)-2-(1,3-Dioxoisoindolin-2-yl)-3-methylbutanoic acid