1 PU2 8-(2,5-dimethoxy-benzyl)-2-fluoro-9h-purin-6-ylamine 1.000 2 PU0 9-butyl-8-(2,5-dimethoxy-benzyl)-2-fluoro-9h-purin-6-ylamine 0.846 3 PUZ 8-(2,5-dimethoxy-benzyl)-2-fluoro-9-pent-9h-purin-6-ylamine 0.815 4 PU7 9-butyl-8-(2,5-dimethoxy-benzyl)-9h-purin-6-ylamine 0.808 5 PU5 9-butyl-8-(3-methoxybenzyl)-9h-purin-6-amine 0.731