1-((2R,5S)-3-(azidomethyl)-5-((trityloxy)methyl)-2,5-dihydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

O2,3'-anhydro-2'-deoxy-2'-methylidene-5'-O-trityluridine

1-((2R,4S,5R)-5-Hydroxymethyl-3-methylene-4-trityloxy-tetrahydro-furan-2-yl)-1H-pyrimidine-2,4-dione

3',5'-di-O-acetyl-2'-deoxy-2'-methylene-β-D-uridine

1-(3',5'-di-O-acetyl-2'-deoxy-2'-methylene-erythro-β-D-pentofuranosyl)-4-O-ethyl-uracil