1-ethyl-3,9-dimethyl-4H-purino[8,7-c][1,2,4]triazine-6,8-dione

1-ethyl-9-methyl-3-thiophen-2-yl-4H-purino[8,7-c][1,2,4]triazine-6,8-dione

2-ethyl-1H-pyrazol-3-one

5-氨基-1-乙基吡唑

1-乙基-3-甲基-1H-吡唑-5-胺