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