Ethyl 4-(bromomethyl)-3-(difluoromethyl)-2-methylpyridine-6-carboxylate
Ethyl 4-(bromomethyl)-3-(difluoromethyl)-2-methylpyridine-5-carboxylate
Ethyl 4-(bromomethyl)-6-(difluoromethyl)-2-methylpyridine-3-carboxylate
Ethyl 4-(bromomethyl)-2-(difluoromethyl)-6-methylpyridine-3-carboxylate