cis-(+/-)-2-Amino-6-chloro-9-<4-(hydroxymethyl)-2-cyclopenten-1-yl>-9H-purine
9-<(1'β,4'β)-4'-<3''-(diethylphosphonomethoxy)propoxy>cyclopent-2'-enyl>-6-methoxy-2-(N-monomethoxytriphenylmethylamino)purine
9-<(1'β,4'β)-4'-<(3''-ethylphosphonomethoxy)propoxy>cyclopent-2'-enyl>-6-methoxy-2-(N-monomethoxytriphenylmethylamino)purine
6-methoxy-2-(N-monomethoxytriphenylmethylamino)-9-<(1'β,4'β)-4'-<4''-(tetrahydropyranyloxy)butoxy>cyclopent-2'-enyl>purine
9-<(1'β,4'β)-4'-<3''-(tert-butyldimethylsilyloxy)propoxy>cyclopent-2'-enyl>-6-methoxy-2-(N-monomethoxytriphenylmethylamino)purine