Acta Cryst. (2011). E67, o2290 [ doi:10.1107/S1600536811031540 ]
Abstract: In the title compound (systematic name: 1,3,7-trimethyl-2,6-dioxo-7H-purin-9-ium hydrogen sulfate monohydrate), C8H11N4O2+·HSO4-·H2O, the crystal packing is stabilized through N-HO and O-HO hydrogen bonds.
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