2′-Deoxy­immunosine: a thia­zolo[4,5-d]pyrimidine nucleoside adopting the syn conformation

The title compound [systematic name: 5-amino-3-(2-deoxy-β-D-erythro-pento­furanosyl)thia­zolo[4,5-d]pyrimidine-2,7-(3H,6H)-dione], C₁₀H₁₂N₄O₅S, exhibits a syn glycosylic bond conformation, with a torsion angle χ of 61.0 (3)°. The furan­ose moiety adopts the N-type sugar pucker (³T₄), with P = 33.0 (5)° and τ_m = 15.1 (1)°. The conformation at the exocyclic C4′—C5′ bond is +ap (trans), with the torsion angle γ = 176.71 (14)°. The extended structure is a three-dimensional hydrogen-bond network involving O—H...O and N—H...O hydrogen bonds.