1-[4-(2,8-diphenyl-purin-9-yl)-phenyl]-cyclobutylamine

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

1-[4-(8-phenyl-2-piperazin-1-yl-purin-9-yl)-phenyl]-cyclobutylamine