N-[[[(3aS,4S,6R,6aR)-6-(3,4-Dihydro-2,4-dioxo-1(2H)-pyrimidinyl)hexahydro-6a-methyl-2-oxo-1H-furo[3,4-d]imidazol-4-yl]methoxy]phenoxyphosphinyl]-D-alanine 1-methylethyl ester

N-[[[(3aR,4R,6R,6aS)-6a-Chloro-6-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-4-fluorohexahydro-2-thioxo-1H-furo[3,4-d]imidazol-4-yl]methoxy]phenoxyphosphinyl]-D-alanine 1-methylethyl ester

N-[[[(3aR,4S,6R,6aS)-6a-Chloro-6-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)hexahydro-2-thioxo-1H-furo[3,4-d]imidazol-4-yl]methoxy]phenoxyphosphinyl]-D-alanine 1-methylethyl ester

N-[[[(3aR,4R,6R,6aS)-6a-Chloro-6-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-4-fluorohexahydro-2-oxo-1H-furo[3,4-d]imidazol-4-yl]methoxy]phenoxyphosphinyl]-D-alanine 1-methylethyl ester

N-[[[(3aR,4S,6R,6aS)-6a-Chloro-6-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)hexahydro-2-oxo-1H-furo[3,4-d]imidazol-4-yl]methoxy]phenoxyphosphinyl]-D-alanine 1-methylethyl ester

D-Alanine, N-(hydroxyphenoxyphosphinyl)-, 1-methylethyl ester, 5′-ester with 1-[4-C-fluoro-3-C-hydroxy-2-C-(hydroxymethyl)-β-D-threo-pentofuranosyl]-2,4(1H,3H)-pyrimidinedione

D-Alanine, N-(hydroxyphenoxyphosphinyl)-, 1-methylethyl ester, 5′-ester with 1-[3-C-hydroxy-2-C-(hydroxymethyl)-β-D-threo-pentofuranosyl]-2,4(1H,3H)-pyrimidinedione

D-Alanine, N-(hydroxyphenoxyphosphinyl)-, 1-methylethyl ester, 5′-ester with 1-[4-C-fluoro-2-C-(hydroxymethyl)-β-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

D-Alanine, N-(hydroxyphenoxyphosphinyl)-, 1-methylethyl ester, 5′-ester with 1-[2-C-(hydroxymethyl)-β-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

N-[2′-Deoxy-4′-C-fluoro-3′-C-hydroxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[2′-Deoxy-3′-C-hydroxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[2′-Deoxy-4′-C-fluoro-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[2′-Deoxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′S)-2′-Cyano-2′-deoxy-4′-C-fluoro-3′-C-hydroxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′S)-2′-Cyano-2′-deoxy-3′-C-hydroxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′R)-2′-Cyano-2′-deoxy-4′-C-fluoro-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′R)-2′-Cyano-2′-deoxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′R)-2′-Deoxy-2′-fluoro-4′-C-fluoro-3′-C-hydroxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′R)-2′-Deoxy-2′-fluoro-3′-C-hydroxy-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester

N-[(2′S)-2′-Deoxy-2′-fluoro-4′-C-fluoro-2′-(hydroxymethyl)-P-phenyl-5′-uridylyl]-D-alanine 1-methylethyl ester