Members of the purine group include adenine and guanine, which are constituents of the nucleic acids, and certain plant alkaloids, e.g. caffeine and theobromine.

• 嘌呤基的成员包括腺嘌呤和鸟嘌呤，它们是核酸以及某些植物生物碱的成分，如咖啡因和可可碱。