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