甲基3-[(甲氧羰基)氨基]-2-吡啶羧酸酯

吡啶并[2,3-d]吡嗪-5,8-二醇

5-(4-methylphenyl)-7H-pyrido[2,3-d]pyridazin-8-one

5-phenylpyrido[3,2-d]oxazin-8-one

8-phenyl-5H-pyrido[2,3-d][1,2]oxazin-5-one