2-oxo-3-(1H-pyridin-4-ylidene)propanoic acid

1-phenyl-3-[(E)-pyridin-4-ylmethylideneamino]thiourea

6-bromo-N-(pyridin-4-ylmethyl)imidazo[1,2-a]pyridin-8-amine

4-(2-methylsulfonylethenyl)pyridine

5-(pyridin-4-ylmethylidene)-1,3-diazinane-2,4,6-trione