2-Amino-7-((2R,3S,4S,5R)-4-fluoro-3-hydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-1,7-dihydro-purin-6-one

2-amino-9-((2S,3S,4S,5R)-3-azido-4-fluoro-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1,9-dihydro-6H-purin-6-one

((2R,3R,4S,5R)-5-(2-acetamido-6-oxo-1,6-dihydro-9H-purin-9-yl)-4-(benzoyloxy)-3-fluorotetrahydrofuran-2-yl)methyl benzoate

((2R,3R,4S,5R)-4-(benzoyloxy)-5-(2-dodecanamido-6-oxo-1,6-dihydro-9H-purin-9-yl)-3-fluorotetrahydrofuran-2-yl)methyl benzoate