4-Allyloxy-2-((2R,3R)-5-benzyloxy-2-trityloxymethyl-tetrahydro-furan-3-yloxy)-5-chloro-pyrimidine

5'-O-trityl-O2,3'-cycloanhydro-N3-thymidine

5-Chloro-1-((2R,4R,5R)-4-hydroxy-5-trityloxymethyl-tetrahydro-furan-2-yl)-1H-pyrimidine-2,4-dione

2-((2R,3R)-5-Benzyloxy-2-trityloxymethyl-tetrahydro-furan-3-yloxy)-3H-pyrimidin-4-one

2-((2R,3R)-5-Benzyloxy-2-trityloxymethyl-tetrahydro-furan-3-yloxy)-5-methyl-3H-pyrimidin-4-one