Ethyl 2-amino-5-(chloromethyl)-3-(difluoromethyl)pyridine-4-carboxylate
Ethyl 3-amino-6-(chloromethyl)-2-(difluoromethyl)pyridine-5-acetate
Ethyl 6-amino-4-(chloromethyl)-3-(difluoromethyl)pyridine-2-carboxylate
Ethyl 5-amino-2-(chloromethyl)-3-(difluoromethyl)pyridine-6-acetate