1-[2,3,5-tri-O-acetyl-3-C-ethynyl-β-D-ribo-pentofuranosyl]-4-N-benzoylcytosine

1-(2,3,5-tri-O-benzoyl-3-C-ethynyl-β-D-ribofuranosyl)cytosine

1-[2-O-(tert-butyldimethylsilyl)-3-C-ethynyl-1-β-D-ribofuranosyl]cytosine

((3aR,5R,6R,6aR)-6-acetoxy-6-ethynyl-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)methyl acetate