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