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The title compound, C4H2INO2S, was synthesized by nitration of iodothiophene with acetyl nitrate. The molecule is essentially planar, withthe nitro group tilted by 1.78 (19)° and the iodine atom displaced by 0.0233 (2) Å with respect to the thiophene ring. In the crystal structure, adjacent molecules are linked through weak I...O interactions [3.039 (2)Å], forming chains extending along the b axis.