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