Methyl 2-amino-3-(difluoromethyl)-5-iodopyridine-6-acetate
Methyl 2-amino-5-chloro-3-(difluoromethyl)pyridine-4-carboxylate
Methyl 2-amino-4-chloro-3-(difluoromethyl)pyridine-5-carboxylate
Methyl 2-amino-3-chloro-4-(difluoromethyl)pyridine-5-carboxylate