4-butyl-1-ethoxycarbonyl-3-methoxycarbonyl-1,4-dihydropyridine

2-pyridin-4-ylpentan-3-one

2-(1-methylimidazol-2-yl)pyridine

ethyl 2-hexylpyridine-1(2H)-carboxylate

ethyl 4-hexyl-4H-pyridine-1-carboxylate