Acta Cryst. (2012). E68, o2665
[ doi:10.1107/S1600536812034393 ]
Abstract: In the crystal structure of the title compound, C11H15NO4S, two independent molecules are present per asymmetric unit; they are dimerized through O-HO hydrogen bonds between their carboxy groups to generate R22(8) loops. An intramolecular N-HO link in one of the molecules closes an S(5) ring. The dimers are linked by N-HO and C-HO hydrogen bonds to form a three-dimensional network. The C atoms of the isopropyl group of one of the molecules are disordered over two orientations in a 3:1 ratio.
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