2-benzoylamino-9-(2-tert-butoxycarbonylethyl)-6-chloropurine

2-N-acetyl-9-N’-(2’-carbethoxy)ethyl-6-O-diphenylcarbamoylguanine

2-氨基-6-氯嘌呤

2-amino-9-(2-(tert-butoxycarbonyl)ethyl)-6-chloropurine

N-2-乙酰鸟嘌呤