1-(9-(4-(1-aminocyclobutyl)phenyl)-8-(pyridin-2-yl)-9H-purin-2-yl)pyrrolidin-3-ol

{1-[4-(2,8-diphenyl-purin-9-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester

{1-[4-(2-methanesulfonylamino-8-pyridin-2-yl-purin-9-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester

N-(9-(4-(1-aminocyclobutyl)phenyl)-8-(pyridin-2-yl)-9H-purin-2-yl)methanesulfonamide

N1-(9-(4-(1-aminocyclobutyl)phenyl)-8-(pyridin-2-yl)-9H-purin-2-yl)ethane-1,2-diamine