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