2,3-diamino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-one

2,3-diamino-5,6,7,8-tetrahydroquinazolin-4-one

5-三氟甲基-[1,2,4]噻嗪-3-胺

2-(3-氨基-1,2,4-噻嗪-5-基)-2-丙醇

2-(3-amino-[1,2,4]triazin-6-yl)propan-2-ol