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