Methyl 3-(aminomethyl)-6-bromo-2-(difluoromethyl)pyridine-5-acetate
Methyl 3-chloro-2-cyano-6-(difluoromethyl)pyridine-5-acetate
Methyl 3-chloro-2-cyano-5-(difluoromethyl)pyridine-6-acetate
Methyl 3-chloro-2-cyano-4-(difluoromethyl)pyridine-6-acetate