title: 9(R)-[6(R)-hydroxymethyl-1-oxa-4-thiacyclohexan-2-yl]hypoxanthine-water (4/3), a nucleoside analogue.
abstract: The title compound, 9(R)-[6(R)-hydroxymethyl-1-oxa-4-thiacyclohexan-2-yl]-1,9-dihydro-6H-purin-6-one-water (4/3), C10H12N4O3S-0.75H2O, crystallizes in the triclinic space group P1 with four molecules in the asymmetric unit and 0.75 waters of hydration per molecule. The structure was refined to an R value of 0.072 for 3382 observed reflections. The four crystallographically independent molecules are designated A, B, C and D. All four oxathiane rings adopt the chair conformation and the purine bases are in an anti orientation with respect to the sugar moieties. Molecules A and D and molecules C and B are base paired by a single hydrogen bond of the type N-H...N. These base pairs are again hydrogen bonded to their translated pairs in the direction of a cell diagonal.
authors.affiliation: Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700 032, India.
authors.forename: G
authors.initials: G
authors.lastname: Mazumder
authors.forename: M
authors.initials: M
authors.lastname: De
authors.forename: S K
authors.initials: SK
authors.lastname: Mazumder
authors.forename: A
authors.initials: A
authors.lastname: Mukhopadhyay
authors.forename: A K
authors.initials: AK
authors.lastname: Das
authors.forename: A
authors.initials: A
authors.lastname: Van Aerschot
mesh_terms: D000998:Antiviral Agents / Q000737:chemistry; D018360:Crystallography, X-Ray; D019271:Hypoxanthine / Q000737:chemistry*; D007042:Hypoxanthines; D015394:Molecular Structure; D009705:Nucleosides / Q000737:chemistry*; D011684:Purine Nucleosides / Q000737:chemistry*
chemical_list: C431285:9-(6-hydroxymethyl-1-oxa-4-thiacyclohexan-2-yl)hypoxanthine; D000998:Antiviral Agents; D007042:Hypoxanthines; D009705:Nucleosides; D011684:Purine Nucleosides; D019271:Hypoxanthine