4,4-dimethyl-2-(4-methyl-4H-pyridin-3-ylidene)-1,3-oxazolidine

2-(4-butyl-4H-pyridin-3-ylidene)-4,4-dimethyl-1,3-oxazolidine

2-(4-butylpyridin-3-yl)-4,4-dimethyl-5H-1,3-oxazole

2-[benzyl(pyridine-3-carbonyl)amino]ethyl pyridine-3-carboxylate

2-[N-(pyridine-3-carbonyl)anilino]ethyl pyridine-3-carboxylate