5-Ethyl-2′-deoxy-4′-thiouridine (R)-S-oxide monohydrate

The pyrimidine ring of the title compound, C₁₁H₁₆N₂O₅S·H₂O, is planar to within 0.026 (1) Å and makes an angle of 77.73 (8)° with the mean plane of the thiosugar ring. In terms of standard nucleoside nomenclature, this ring has a C1′-exo,C2′-endo conformation. The O5′—C5′—C4′—C3′ torsion angle is −167.4 (2)° and the glycosidic S4′—C1′—N1—C2 torsion angle is −101.8 (2)° (anti).