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