5'-O-acetyl-1-(2,4-dinitrophenyl)-2',3'-O-isopropylideneinosine
(R)-2-Benzyloxy-1-[(4R,5S)-5-(6-methoxy-purin-9-ylmethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-ethanol
9-(5-O-benzyl-2,3-O-isopropylidene-D-ribofuranosyl)-6-methoxypurine
9-[(2S,3S)-(2,3-isopropylidenedioxy-5-trityloxy-4-pentanone)-1-yl]-6-methoxypurine
(R)-1-[(4R,5S)-5-(6-Methoxy-purin-9-ylmethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-2-trityloxy-ethanol