Crystal structure and Hirshfeld surface analysis of 2-amino-3-hydroxypyridin-1-ium 6-methyl-2,2,4-trioxo-2H,4H-1,2,3-oxathiazin-3-ide

The asymmetric unit of the title compound, C5H7N2O(+).C4H4NO4S(-), contains one cation and one anion. The 6-methyl-2,2,4-trioxo-2H,4H-1,2,3-oxa-thia-zin-3-ide anion adopts an envelope conformation with the S atom as the flap. In the crystal, the anions and cations are held together by N-Hcdots, three dots, centeredO, N-Hcdots, three dots, centeredN, O-Hcdots, three dots, centeredO and C-Hcdots, three dots, centeredO hydrogen bonds, thus forming a three-dimensional structure. The Hirshfeld surface analysis and fingerprint plots reveal that the crystal packing is dominated by Ocdots, three dots, centeredH/Hcdots, three dots, centeredO (43.1%) and Hcdots, three dots, centeredH (24.2%) contacts.