5′-O-[[[6-[[(3,4-Dihydro-5,6-dimethyl-3-oxo-2-pyrazinyl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(3,4-Dihydro-5-methyl-4-oxothieno[2,3-d]pyrimidin-6-yl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(3,4-Dihydro-3,5-dimethyl-4-oxothieno[2,3-d]pyrimidin-6-yl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[2-[(3,4-Dihydro-4-oxo-2-quinazolinyl)methoxy]acetyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[Hydroxy[[6-[[3-(4,5,6,7-tetrahydro-4-oxo-1H-cyclopenta[4,5]thieno[2,3-d]pyrimidin-2-yl)-1-oxopropyl]amino]hexyl]oxy]phosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[4-(3,4-Dihydro-4-oxo-2-quinazolinyl)-1-oxobutyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[Hydroxy[[6-[[1-oxo-3-(4-oxo-3(4H)-quinazolinyl)propyl]amino]hexyl]oxy]phosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[3-(3,4-Dihydro-3-oxo-2-quinoxalinyl)-1-oxopropyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[[3,4-Dihydro-2-(4-morpholinylmethyl)-4-oxo-7-quinazolinyl]carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(3,4-Dihydro-4-oxo-7-quinazolinyl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(1,2-Dihydro-1-oxo-4-isoquinolinyl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(1,2-Dihydro-2-oxo-3-quinolinyl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(2,5,6,7,8,9-Hexahydro-2-oxo-1H-cyclohepta[b]pyridin-3-yl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(1,2,5,6,7,8-Hexahydro-7,7-dimethyl-2,5-dioxo-3-quinolinyl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-[[[6-[[(1,2,5,6,7,8-Hexahydro-2,5-dioxo-3-quinolinyl)carbonyl]amino]hexyl]oxy]hydroxyphosphinyl]thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

(2′S)-2′-Chloro-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-methyl-3′-oxouridine

(2R)-2-Chloro-1,2-dideoxy-1-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-methyl-β-D-erythro-pentofuranuronic acid