Methyl 5-(aminomethyl)-2-cyano-3-(difluoromethyl)pyridine-4-carboxylate
Methyl 3-(aminomethyl)-4-cyano-2-(difluoromethyl)pyridine-5-carboxylate
Methyl 3-(bromomethyl)-4-cyano-2-(difluoromethyl)pyridine-6-acetate
2-(Chloromethyl)-3-cyano-6-(difluoromethyl)pyridine-4-acetic acid