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

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

4-甲氧基苯基(3-吡啶基)甲酮

2-(甲氧基羰基)烟酸

2,3-吡啶二羧酸-3-甲酯