4-氯-6-吗啉-5-嘧啶甲醛

4,6-二氯嘧啶-5-甲腈

4-氨基-6-氯-5-醛基嘧啶

1-甲基-4-氯吡唑并[3,4-d]嘧啶

(5-amino-2-hydroxy-1H-pyrimido[5,4-e]azaborinin-3-yl)boronic acid