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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.

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The title compound, C13H14N2O3·0.5H2O, was synthesized by the condensation of methyl 3-amino­propionate with 3-trichloro­acetyl­indole. The two organic mol­ecules in the asymmetric unit are both close to planar, with r.m.s. deviations from the best fit plane through all of the non-H atoms of 0.004 (2) Å for mol­ecule A and 0.006 (1) Å for mol­ecule B. Also, the five- and six-membered rings of the indole systems are inclined at 1.67 (8) and 1.50 (8)° in mol­ecules A and B, respectively. In the crystal structure, the organic molecules are connected by inter­molecular N—H...O hydrogen bonds, forming chains. O—H...O and N—H...O hydrogen-bond inter­actions involving the water molecules inter­link these chains, forming double chains approximately parallel to the a axis.
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