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