Uridine, 2′-deoxy-3-(4-methylbenzoyl)-5-[2-[5-[4-oxo-3-[[(phenylmethoxy)carbonyl]oxy]-4H-1-benzopyran-2-yl]-2-thienyl]ethynyl]-, 3′,5′-diacetate

Uridine, 2′-deoxy-3-(4-methylbenzoyl)-5-[2-[5-[4-oxo-3-[[(phenylmethoxy)carbonyl]oxy]-4H-1-benzopyran-2-yl]-2-furanyl]ethynyl]-, 3′,5′-diacetate

Uridine, 2′-deoxy-3-(4-methylbenzoyl)-5-[2-[4-[4-oxo-3-[[(phenylmethoxy)carbonyl]oxy]-4H-1-benzopyran-2-yl]phenyl]ethynyl]-, 3′,5′-diacetate

3-(3,5-Di-O-acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-6-[5-[3-[(2-methoxyethoxy)methoxy]-4-oxo-4H-1-benzopyran-2-yl]-2-furanyl]furo[2,3-d]pyrimidin-2(3H)-one

Uridine, 2′-deoxy-5-[2-[5-[3-[(2-methoxyethoxy)methoxy]-4-oxo-4H-1-benzopyran-2-yl]-2-furanyl]ethynyl]-, 3′,5′-diacetate

2′-Deoxy-5-[2-[5-(3-hydroxy-4-oxo-4H-1-benzopyran-2-yl)-2-furanyl]ethynyl]uridine

2′-Deoxy-5-[2-[4-(3-hydroxy-4-oxo-4H-1-benzopyran-2-yl)phenyl]ethynyl]uridine

N-[2-[[3-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-N′-[2-[[(triphenylmethyl)thio]methyl]phenyl]urea

N-[2-[[3-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-N′-[[hexahydro-5,5-dimethyl-2-[[(triphenylmethyl)thio]methyl]-2-pyrimidinyl]methyl]urea

N-[2-[[3-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-N′-[(2R)-2-hydroxy-3-[(triphenylmethyl)thio]propyl]-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

N-[2-[[3-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-N′-[2-(mercaptomethyl)phenyl]urea

N-[2-[[3-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]-N′-[[2-(mercaptomethyl)-5,5-dimethyl-1,3-dioxan-2-yl]methyl]urea