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