4-Amino-1-[(2R)-2-deoxy-2-fluoro-2-(3-fluoro-1-propyn-1-yl)-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

5-Amino-2-[(2R)-2-deoxy-2-fluoro-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-2-(1-propyn-1-yl)-β-D-erythro-pentofuranosyl]-1,2,4-triazin-3(2H)-one

4-Amino-1-[(2R)-2-deoxy-2-fluoro-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-2-(1-propyn-1-yl)-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

5-Amino-2-[(2R)-2-(2-chloroethynyl)-2-deoxy-2-fluoro-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-1,2,4-triazin-3(2H)-one

5-Amino-2-[(2R)-2-deoxy-2-ethynyl-2-fluoro-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-1,2,4-triazin-3(2H)-one

4-Amino-1-[(2R)-2-deoxy-2-ethynyl-2-fluoro-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

5-Amino-2-[2-C-(3-fluoro-1-propyn-1-yl)-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-ribofuranosyl]-1,2,4-triazin-3(2H)-one

4-Amino-1-[2-C-(3-fluoro-1-propyn-1-yl)-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-ribofuranosyl]-1,3,5-triazin-2(1H)-one

5-Amino-2-[5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-2-C-1-propyn-1-yl-β-D-ribofuranosyl]-1,2,4-triazin-3(2H)-one

4-Amino-1-[5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-2-C-1-propyn-1-yl-β-D-ribofuranosyl]-1,3,5-triazin-2(1H)-one

5-Amino-2-[2-C-(2-chloroethynyl)-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-ribofuranosyl]-1,2,4-triazin-3(2H)-one

5-Amino-2-[2-C-ethynyl-5-O-[(S)-[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethoxy]phenoxyphosphinyl]-β-D-ribofuranosyl]-1,2,4-triazin-3(2H)-one