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In the title compound, C11H10INO3, an addition product of itaconic acid anhydride and 4-iodo­aniline, the least-squares planes defined by the atoms of the aromatic moiety and the non-H atoms of the carb­oxy­lic acid group enclose an angle of 74.82 (11)°. In the crystal, classical O—H...O hydrogen bonds formed by carb­oxy­lic groups, as well as N—H...O hydrogen bonds formed by amide groups, are present along with C—H...O contacts. Together, these connect the mol­ecules into dimeric chains along the b-axis direction.
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