Ethyl 4-chloro-2-(difluoromethyl)-3-fluoropyridine-6-acetate
Methyl 4-bromo-3-(bromomethyl)-6-(difluoromethyl)pyridine-2-acetate
Ethyl 5-chloro-3-(difluoromethyl)-2-fluoropyridine-4-acetate
Methyl 4-bromo-3-(bromomethyl)-5-(difluoromethyl)pyridine-2-acetate