Ethyl 3-(chloromethyl)-2-(difluoromethyl)-6-methoxypyridine-4-carboxylate
Ethyl 3-(chloromethyl)-2-(difluoromethyl)-4-methoxypyridine-6-carboxylate
Ethyl 2-(chloromethyl)-6-(difluoromethyl)-5-methoxypyridine-3-carboxylate
Ethyl 2-(chloromethyl)-6-(difluoromethyl)-3-methoxypyridine-5-carboxylate