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