Methyl 5-bromo-3-cyano-4-(difluoromethyl)pyridine-2-carboxylate
Methyl 3-bromo-5-cyano-2-(difluoromethyl)pyridine-6-carboxylate
Methyl 3-bromo-2-cyano-4-(difluoromethyl)pyridine-6-carboxylate
Methyl 3-bromo-2-cyano-5-(difluoromethyl)pyridine-6-carboxylate