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