9-(4-bromobutyl)purin-6-amine

9-(5-bromopentyl)purin-6-amine

5-(6-aminopurin-9-yl)pentanenitrile

8-(3,4,5-trimethoxyphenyl)sulfanyl-7H-purin-6-amine

[3-(6-aminopurin-7-yl)-4-hydroxybutoxy]methylphosphonic acid