(1R,4R,5S)-(-)-1-amino-3-((benzyloxy)methyl)-4,5-O-isopropylidene-2-cyclopentene

(1R,4R,5S)-(-)-1-((5-amino-6-chloropyrimidinyl)amino)-3-((benzyloxy)methyl)-4,5-O-isopropylidene-2-cyclopentene

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

(1R,2S,3S)-1-(tert-butoxymethyl)-2,3-(isopropylidenedioxy)-4-cyclopenten-1-ol

(1S,2S,3R)-2,3-(isopropylidenedioxy)-4-(tert-butoxymethyl)-4-cyclopenten-1-ol