Ethyl 4-chloro-5-(difluoromethyl)-2-fluoropyridine-3-carboxylate
Ethyl 4-chloro-5-(difluoromethyl)-3-fluoropyridine-2-carboxylate
Ethyl 4-chloro-3-(difluoromethyl)-2-fluoropyridine-6-carboxylate
Ethyl 4-chloro-6-(difluoromethyl)-3-fluoropyridine-2-carboxylate