Ethyl 2-bromo-6-(difluoromethyl)-3-nitropyridine-4-acetate
Ethyl 6-bromo-3-(difluoromethyl)-2-nitropyridine-4-acetate
Methyl 2-bromo-3-(chloromethyl)-6-(difluoromethyl)pyridine-5-acetate
Methyl 2-bromo-3-(chloromethyl)-5-(difluoromethyl)pyridine-6-acetate