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The structure of the title compound, [4-amino-1-(2-deoxy-β-D-ribofuranosyl)-2-oxo-(1H)-3-pyrimidinio](cyano)borate, C10H15BN4O4.H2O, features an interaction of 2.05 (4) Å between an H atom of the —BH2CN group and an H atom of the —NH2 group. The —C≡N group does not lie in the cytosine plane, the N atom being 2.24 Å away from the plane. The cytosine rings are stacked with almost complete overlap along the twofold screw axis with an interplanar separation of 4.03 Å. The sugar is in the 43T puckering mode, the C(5′)—O(5′) bond has the gg conformation and the relative orientation of the sugar and the base is anti.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks text, bk1157a

CCDC reference: 126400

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