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