(3'R,4'S,5'R)-3'-(6-aminopurin-9-yl)-1'-hydroxymethyl-4',5'-O-isopropylidene-cyclopent-1'-en-4',5'-diol

9-((1R,2S,3R)-4-(((methoxymethyl)oxy)methyl)-2,3-((dimethylmethylene)dioxy)-4-cyclopenten-1-ylk)adenine

(-)-9-((1R,4R,5S)-3-((benzyloxy)methyl)-4,5-O-isopropylidene-2-cyclopenten-1-yl)adenine

(1R,4R,5S)-9-[3-(tert-butyldiphenylsilyloxymethyl)-4,5-isopropylidenedioxy-2-cyclopenten-1-yl]-N6,N6-bis(tert-butoxycarbonyl)adenine

(1R,4R,5S)-9-[3-(tert-butyldiphenylsilyloxymethyl)-4,5-isopropylidenedioxy-2-cyclopenten-1-yl]adenine