1-β-D-Ribofuranosyl-1H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazine

3-β-D-Ribofuranosyl-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazine

1-(2,3,5-Tri-O-acetyl-β-D-ribofuranosyl)-1H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazine

3-(2,3,5-Tri-O-acetyl-β-D-ribofuranosyl)-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazine

1-(2-Deoxy-2-fluoro-β-D-arabinofuranosyl)-5,6-difluoro-1H-benzimidazol-2-amine

N′-(5,6-Difluoro-1-β-D-ribofuranosyl-1H-benzimidazol-2-yl)-N,N-dimethylmethanimidamide

5,6-Difluoro-N-(1-methylethyl)-1-β-D-ribofuranosyl-1H-benzimidazol-2-amine

1-(2-Deoxy-β-D-erythro-pentofuranosyl)-5,6-difluoro-1H-benzimidazol-2-amine

5,6-Difluoro-1-β-D-ribofuranosyl-1H-benzimidazol-2-amine

8-(2-Aminoethoxy)-3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

N-[2-[[3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-8-yl]oxy]ethyl]-2,2,2-trifluoroacetamide

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-8-yl]oxy]ethyl]-2,2,2-trifluoroacetamide

8-(2-Azidoethoxy)-3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

8-(2-Azidoethoxy)-3-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one

5-Bromo-1-(3,5-di-O-acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-4-(1H-1,2,4-triazol-1-yl)-2(1H)-pyrimidinone