2,4,6-三氯嘧啶

2-氨基-4-羟基吡咯并[2,3-d]嘧啶

2-氨基-4-氧代-4,7-二氢-3H-吡咯并[2,3-D]嘧啶-5-甲腈

2,4-二氨基-6-乙氧基嘧啶

(5Z)-2,6-diamino-5-(phenylhydrazinylidene)pyrimidin-4-one