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