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