(2S,3S,4R,5R)-3-amino-5-[6-[[5-chloro-2-(2-oxo-2-piperazin-1-ylethoxy)phenyl]methylamino]purin-9-yl]-4-hydroxy-N-methyloxolane-2-carboxamide
(2S,3S,4R,5R)-3-amino-5-[6-[[5-chloro-2-(2-oxo-2-piperazin-1-yl-ethoxy)phenyl]methylamino]purin-9-yl]-4-hydroxy-N-methyl-tetrahydrofuran-2-carboxamide
(2S,3S,4R,5R)-3-amino-5-[6-[[5-chloro-2-[2-oxo-2-(1-piperazinyl)ethoxy]phenyl]methylamino]-9-purinyl]-4-hydroxy-N-methyl-2-tetrahydrofurancarboxamide
(2S,3S,4R,5R)-3-amino-5-[6-[[5-chloro-2-(2-keto-2-piperazin-1-yl-ethoxy)benzyl]amino]purin-9-yl]-4-hydroxy-N-methyl-tetrahydrofuran-2-carboxamide
(2S,3S,4R,5R)-3-amino-5-[6-[[5-chloro-2-(2-oxo-2-piperazin-1-yl-ethoxy)phenyl]methylamino]purin-9-yl]-4-hydroxy-N-methyl-oxolane-2-carboxamide