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