organic compounds
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In the crystal structure of the title salt, C4H6N3O+·HSeO3−, systematic name 6-amino-2-methylidene-2,3-dihydropyrimidin-1-ium hydrogen selenite, the hydrogenselenite anions and the cytosinium cations are linked via N—HO, N—HSe, O—HO, O—H··Se and C—HO hydrogen bonds, forming a three-dimensional framework.