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