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