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