5-iodo-1-(2-deoxy-2-fluoro-4-thio-β-D-arabinopentofuranosyl)uracil

1-[(2S,3S,4S,5R)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-4-hydroxy-tetrahydro-thiophen-2-yl]-4-hydroxy-5-iodo-1H-pyrimidin-2-one

1-[(2R,3S,4S,5R)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-4-hydroxy-tetrahydro-thiophen-2-yl]-4-hydroxy-5-iodo-1H-pyrimidin-2-one

1-[(2S,3S,4S,5R)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-4-hydroxy-tetrahydro-thiophen-2-yl]-5-ethyl-4-hydroxy-1H-pyrimidin-2-one

1-[(2R,3S,4S,5R)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-4-hydroxy-tetrahydro-thiophen-2-yl]-5-ethyl-4-hydroxy-1H-pyrimidin-2-one