7-methyl-1H-pteridin-4-one

[1,2,5]噻二唑并[3,4-d]嘧啶-7(3H)-酮

4,5-Dihydro-1-oxo-thieno<2,3-c>pyridine

N-(6-amino-4-oxo-1H-pyrimidin-5-yl)acetamide