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