7-[3-O-[(1,1-Dimethylethyl)dimethylsilyl]-2-O-(hydroxyphosphinyl)-β-D-ribofuranosyl]-3,7-dihydro-4H-imidazo[4,5-d]-1,2,3-triazin-4-one

7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,7-dihydro-4H-imidazo[4,5-d]-1,2,3-triazin-4-one

7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,7-dihydro-4H-imidazo[4,5-d]-1,2,3-triazin-4-one

9-[5-O-(1-Hydroxy-8,8-dimethyl-1-oxido-5-oxo-2,4,6-trioxa-1-phosphonon-1-yl)-β-D-ribofuranosyl]-1H-1,2,4-triazole-3-carboxamide

2,4,6-Trioxa-5-phosphaheptanoic acid, 7-[(2S,5R)-5-(1,6-dihydro-6-oxo-9H-purin-9-yl)tetrahydro-2-furanyl]-5-hydroxy-, 2,2-dimethylpropyl ester, 5-oxide

9-[5-O-(1-Hydroxy-8,8-dimethyl-1-oxido-5-oxo-2,4,6-trioxa-1-phosphanon-1-yl)-β-D-arabinofuranosyl]-9H-purin-6-amine

2,4,6-Trioxa-5-phosphaheptanoic acid, 7-[(2S,5R)-5-(4-amino-2-oxo-1(2H)-pyrimidinyl)tetrahydro-2-furanyl]-5-hydroxy-, 2,2-dimethylpropyl ester, 5-oxide