The deoxyribose ring in the title compound adopts the twist conformati
on (T-2(3)) with a glycosyl torsion angle of 231.0(6)degrees. The pseu
do-rotation parameters are P = 180.29(5)degrees and tau(m) = 38.3(5)de
grees. The exocyclic side chain at C5' has the t conformation [gamma =
174.8(11)degrees]. The ethyl group at C5 is on the same side of the p
yrimidine plane as the O4' atom of the furanose ring.