(2R,3R,4S,5R)-2-[6-(cyclobutylamino)purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol
(2R,3R,4S,5R)-2-[6-(cyclobutylamino)purin-9-yl]-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
(2R,3R,4S,5R)-2-[6-(cyclobutylamino)-9-purinyl]-5-(hydroxymethyl)tetrahydrofuran-3,4-diol
(2R,3R,4S,5R)-2-[6-(cyclobutylamino)purin-9-yl]-5-methylol-tetrahydrofuran-3,4-diol