Acetic acid (1R,4R)-4-(6-amino-purin-9-yl)-cyclopent-2-enyl ester

(3aR,4R,6R,6aS)-6-(6-Amino-purin-9-yl)-2,2-dimethyl-tetrahydro-cyclopenta[1,3]dioxol-4-ol

Acetic acid (1R,2S,3S,4R)-4-(6-amino-purin-9-yl)-2,3-dihydroxy-cyclopentyl ester