Pyridine series

α-Ketobutyric acid sodium salt

3-Bromobenzophenone

5(6)-Carboxyfluorescein

2',7'-Dichlorofluorescein

4-Acetylbutyric acid

5-Phenyl-3H-thieno[2,3-d]pyrim

4-(Methoxycarbonyl)nicotinic a

2-Amino-6-methyl-4,5,6,7-tetra

5-Bromo-6-chloro-3-indolyl pho

2,2′-Biquinoline-4,4′-dicarbox

3,5,6-Trichloro-pyridine-2-car

2,3-Diphenylpropionic acid