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

tert-butyl 1-(4-(2-methoxy-8-phenyl-9H-purin-9-yl)phenyl)cyclobutylcarbamate

1-(4-(2-methoxy-8-phenyl-9H-purin-9-yl)phenyl)cyclobutanamine

1-{9-[4-(1-amino-cyclobutyl)-phenyl]-8-phenyl-9H-purin-2-yl}-pyrrolidin-2-one

{9-[4-(1-amino-cyclobutyl)-phenyl]-8-phenyl-9H-purin-2-yl}-methyl-amine