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