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

Methyl 3-(3-pyridinyl)-2-propynoate

methyl 5-(3-methylphenyl)pyridine-3-carboxylate