3-苄基腺嘌呤

乙羟茶碱

茶碱乙酸

7-[(4,4-dimethyl-1,3-benzothiazin-2-yl)methyl]-1,3-dimethylpurine-2,6-dione

1,3-dimethyl-7-(2-oxopropyl)purine-2,6-dione