2-amino-8-[2-(4-methylphenyl)hydrazinyl]purin-6-one

2-amino-8-[2-(4-bromophenyl)hydrazinyl]purin-6-one

N7-[(2-羟基乙氧基)甲基)鸟嘌呤

N-(9-acetyl-6-chloropurin-2-yl)acetamide

2-[(2-amino-6-oxo-3H-purin-9-yl)methoxy]ethyl benzoate