1-[(2R,3S,3aR,6aS)-3,4-dihydroxy-2,3,3a,4,6,6a-hexahydrofuro[2,3-c]furan-2-yl]-5-methylpyrimidine-2,4-dione

1-[5-O-(tert-butyldiphenylsilyl)-3-deoxy-3-C-formyl-β-D-arabino-pentofuranosyl]thymine

1-[(2R,3S,4S,5S)-3-hydroxy-5-(hydroxymethyl)-4-(5-methyl-1,3,5-dithiazinan-2-yl)oxolan-2-yl]-5-methylpyrimidine-2,4-dione

5-methyl-1-[(2R,4R)-4-(trityloxymethyl)-3,6-dioxabicyclo[3.1.0]hexan-2-yl]pyrimidine-2,4-dione

1-[5-O-(tert-butyldiphenylsilyl)-3-deoxy-3-C-(4,5-dihydro-5-methyl-1,3,5-dithiazin-2-yl)-β-D-arabino-pentofuranosyl]thymine

1-((2R,3S,4S,5S)-3-hydroxy-4-(5-methyl-1,3,5-dithiazinan-2-yl)-5-((trityloxy)methyl)tetrahydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione