Ethyl 2-amino-5-(chloromethyl)-3-(difluoromethyl)pyridine-4-acetate
Ethyl 2-amino-5-(chloromethyl)-4-(difluoromethyl)pyridine-3-acetate
Ethyl 2-amino-3-(chloromethyl)-5-(difluoromethyl)pyridine-6-acetate
3-Amino-5-(chloromethyl)-6-(difluoromethyl)pyridine-2-acetic acid