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