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