(1R,2R,3R,4S)-4-azido-1-(6-amino-9H-purin-9-yl)cyclopentane-2,3-diol

(1R,4S)-N-[9-(4-azido-2-cyclopentyl)-9H-purin-6-yl]benzamide

(1R,4S)-9-<4-<(4,4'-Dimethoxytrityl)oxy>-2-cyclopenten-1-yl>-9H-adenine

(1S,3S,4S)-9-<3-Hydroxy-4-<(4,4'-dimethoxytrityl)oxy>cyclopent-1-yl>-9H-adenine

(1R,2R,4S)-9-<2-Hydroxy-4-<(4,4'-dimethoxytrityl)oxy>cyclopent-1-yl>-9H-adenine