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