In the crystal structure of the title salt, C4H6N3O+·HSeO3?, systematic name 6-amino-2-methyl-idene-2,3-di-hydro-pyrim-idin-1-ium hydrogen selenite, the hydrogenselenite anions and the cytosinium cations are linked via N—H?O, N—H?Se, O—H?O, O—H··Se and C—H?O hydrogen bonds, forming a three-dimensional framework.
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