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