2-Amino-3-(chloromethyl)-6-(difluoromethyl)pyridine-5-acetic acid
5-Amino-2-(bromomethyl)-3-(difluoromethyl)-6-(trifluoromethyl)pyridine
2-Amino-3-(chloromethyl)-5-(difluoromethyl)pyridine-6-acetic acid
2-Amino-3-(chloromethyl)-5-(difluoromethyl)pyridine-4-acetic acid