2-氨基-6-甲氧基嘌呤

9-乙基鸟嘌呤

9-(4-乙酰氧基-3-乙酰氧甲基丁基)-2-氨基-6-氯嘌呤

7-<4-acetoxy-3-(acetoxymethyl)butyl>-2-amino-6-chloro-9H-purine

4-cyano-5-(cyanoamino)imidazole