Acta Cryst. (2013). E69, o524-o525 [ doi:10.1107/S1600536813003826 ]
Abstract: The title compound, C13H10O4S, crystallizes with two molecules in the asymmetric unit in which the rings make dihedral angles of 3.9 (1) and 6.0 (1)°; this planarity is due in part to the presence of an intramolecular O-HO hydrogen bond, which generates an S(6) ring in each molecule. Both molecules represent E isomers with respect to the central C=C bond. In the crystal, molecules are linked by C-HO interactions into a three-dimensional network.
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