1-((2R,3R,4R,5R)-4-((tert-butyldimethylsilyl)oxy)-5-(((tert-butyldiphenylsilyl)oxy)methyl)-5-ethynyl-3-fluorotetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

3-(((4aR,6R,7R,7aR)-4a-ethyl-7-fluoro-6-(4-(((4-methoxyphenyl)diphenylmethyl)amino)-2-oxopyrimidin-1(2H)-yl)-2-oxidotetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-2-yl)oxy)propanenitrile

1-((4aR,6R,7R,7aR)-4a-ethyl-7-fluoro-2-hydroxy-2-oxidotetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-6-yl)-4-(((4-methoxyphenyl)diphenylmethyl)amino)pyrimidin-2(1H)-one

(((4aR,6R,7R,7aR)-4a-ethyl-7-fluoro-6-(4-(((4-methoxyphenyl)diphenylmethyl)amino)-2-oxopyrimidin-1(2H)-yl)-2-oxidotetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-2-yl)oxy)methyl pivalate

(((4aR,6R,7R,7aR)-6-(4-amino-2-oxopyrimidin-1(2H)-yl)-4a-ethyl-7-fluoro-2-oxidotetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-2-yl)oxy)methyl pivalate