organic compounds
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In the zwitterionic title compound, C9H13NO2S, the pyrrolidine heterocycle adopts an envelope conformation (with the C atom in the 7-position as the flap). The negative charge is delocalized over the two carbonyl groups and the C atom connecting them. The positive charge is located on the S atom. Two intermolecular C—HO interactions are observed. The molecular geometry at the S atom is trigonal pyramidal.