N′-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-9H-purin-2-yl]-N,N-dibutylmethanimidamide

N′-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-9H-purin-2-yl]-N,N-dibutylmethanimidamide

N,N-Dibutyl-N′-[9-[2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-9H-purin-2-yl]methanimidamide

N,N-Dibutyl-N′-(9-β-D-ribofuranosyl-9H-purin-2-yl)methanimidamide

N-[4,8-Dihydro-4-oxo-8-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)imidazo[1,2-a]-1,3,5-triazin-2-yl]-2-methylpropanamide

2-Amino-6-iodo-8-β-D-ribofuranosylimidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-6-iodo-8-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)imidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-8-[2-deoxy-3,5-bis-O-(4-methylbenzoyl)-α-D-erythro-pentofuranosyl]-6-iodoimidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-8-[2-deoxy-3,5-bis-O-(4-methylbenzoyl)-β-D-erythro-pentofuranosyl]-6-iodoimidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-7-(2-deoxy-β-D-erythro-pentofuranosyl)-3,7-dihydro-5-(1-pyrenyl)-4H-pyrrolo[2,3-d]pyrimidin-4-one

2-Amino-8-(2-deoxy-α-D-erythro-pentofuranosyl)-6-[2-(1-pyrenyl)ethynyl]imidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-8-(2-deoxy-α-D-erythro-pentofuranosyl)-6-(1-pyrenyl)imidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-8-(2-deoxy-α-D-erythro-pentofuranosyl)-6-(2-phenylethynyl)imidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-6-(2-benzofuranyl)-8-(2-deoxy-α-D-erythro-pentofuranosyl)imidazo[1,2-a]-1,3,5-triazin-4(8H)-one

2-Amino-8-(2-deoxy-α-D-erythro-pentofuranosyl)-6-(2-furanyl)imidazo[1,2-a]-1,3,5-triazin-4(8H)-one