((3aR,5R,6R,6aR)-6-cyano-6-hydroxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)methyl benzoate

(2',5'-bis-O-(tert-butyldimethylsilyl)-beta-ribofuranosyl)-3'-spiro-5''-(4''-amino-1'',2''-oxathiole-2'',2''-dioxide)thymine

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

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

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

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

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]pyrimidine-2,4-dione

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

[(6R,8R,9R)-9-acetyloxy-4-amino-8-(5-methyl-2,4-dioxopyrimidin-1-yl)-2,2-dioxo-1,7-dioxa-2λ6-thiaspiro[4.4]non-3-en-6-yl]methyl benzoate

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