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