N-[7-[3,5-Bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-O-methyl-β-D-ribofuranosyl]-4-[2-(methylthio)ethyl]-5-(1-propyn-1-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-phenoxyacetamide

7-[3,5-Bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-O-methyl-β-D-ribofuranosyl]-4-[2-(methylthio)ethyl]-5-(1-propyn-1-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-amine

7H-Pyrrolo[2,3-d]pyrimidin-4-ol, 2-amino-7-[3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-O-methyl-β-D-ribofuranosyl]-5-(1-propyn-1-yl)-, 4-(4-methylbenzenesulfonate)

2-Amino-7-[3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-O-methyl-β-D-ribofuranosyl]-3,7-dihydro-5-(1-propyn-1-yl)-4H-pyrrolo[2,3-d]pyrimidin-4-one

2-Amino-7-[3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-O-methyl-β-D-ribofuranosyl]-3,7-dihydro-5-iodo-4H-pyrrolo[2,3-d]pyrimidin-4-one

5-Iodo-4-methoxy-7-(2-O-methyl-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-2-amine

Cytidine, N-[2-[[3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-2′-deoxy-, 3′,5′-diacetate

Cytidine, 2′-deoxy-N-[2-[[3-[2-deoxy-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-, 3′,5′-diacetate

Uridine, 2′-deoxy-, 3′,5′-diacetate 4-(2,4,6-trimethylbenzenesulfonate)

1H-Pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one, 9-(2-aminoethoxy)-3-[2-deoxy-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-erythro-pentofuranosyl]-

Carbamic acid, [2-[[3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]methoxy]ethyl]-, 9H-fluoren-9-ylmethyl ester

9-[(2-Azidoethoxy)methyl]-3-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

9-[(2-Aminoethoxy)methyl]-3-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

Cytidine, N-[2-[(2-azidoethoxy)methyl]-6-hydroxyphenyl]-5-bromo-2′-deoxy-, 3′,5′-diacetate

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-9-[2-(dimethylamino)ethoxy]-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

Carbamic acid, [3-[[3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]propyl]-, 9H-fluoren-9-ylmethyl ester

Carbamic acid, [2-[[3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-, 9H-fluoren-9-ylmethyl ester

3-(2-Deoxy-β-D-erythro-pentofuranosyl)-9-[2-(dimethylamino)ethoxy]-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

Carbamic acid, [3-[[3-(2-deoxy-β-D-erythro-pentofuranosyl)-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]propyl]-, phenylmethyl ester

Cytidine, 5-bromo-2′-deoxy-N-[2-[2-(dimethylamino)ethoxy]-6-hydroxyphenyl]-, 3′,5′-diacetate