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