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