Acta Cryst. (2008). E64, o636  [ doi:10.1107/S1600536808005151 ]

(3R,5S)-5(3)-Carboxy-3,4,5,6-tetrahydro-2H-1,4-thiazin-4-ium-3(5)-carboxylate

G. Portalone, A. Cassetta, M. Colapietro and S. H. Plattner

Abstract: The molecule of the zwitterionic title compound, C₆H₉NO₄S, which lies on a mirror plane, shows a puckered chair conformation of the six-membered ring with the S and N atoms out of the mean plane of the other four C atoms by 0.929 (2) and 0.647 (2) Å, respectively. The ionized carboxyl group is equatorially oriented. The hydrogen-bonding network includes very short O-HO [2.470 (2) Å] and N-HS [3.471 (2) and 3.416 (2) Å] intermolecular contacts.

Online 27 February 2008

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