(2S,3S,4R,5R)3-azido-5-{6-[5-chloro-2-(2-oxo-2-piperazin-1-yl-ethoxy)-benzylamino]-purin-9-yl}-4-hydroxy-tetrahydro-furan-2-carboxylic acid methylamide

3-azido-5-{6-[5-chloro-2-(3-methylisoxazol-5-ylmethoxy) benzylamino]purin-9-yl}-4-hydroxytetrahydrofuran-2-carboxylic acid methylamide

(2S,3S,4R,5R) 3-azido-4-hydroxy-5-(6-[3-iodobenzylamino]-purin-9-yl)-tetrahydro-furan-2-carboxylic acid methylamide

3-amino-5-(6-(3-iodobenzylamino)purin-9-yl)-4-t-butyldimethylsiloxy-tetrahydro-furan-2-carboxylic acid methyl amide

3-azido-5-(6-(3-iodobenzylamino)purin-9-yl)-4-t-butyldimethylsiloxy-tetrahydro-furan-2-carboxylic acid methyl amide