1-[(6R,8R,9R)-4-amino-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-9-hydroxy-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-8-yl]-5-methylpyrimidine-2,4-dione

1-[(6R,8R,9R)-4-amino-9-hydroxy-6-(hydroxymethyl)-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-8-yl]-5-methylpyrimidine-2,4-dione

(2S,3R,5R)-2-[[tert-butyl(dimethyl)silyl]oxymethyl]-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolane-3-carbonitrile

(2S,3S,5R)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolane-3-carbonitrile

1-(2',5'-di-O-(t-butyldimethylsilyl)-3'-C-cyano-3'-deoxy-β-D-xylo-pentoifuranosyl)thymine