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