4-(Bromomethyl)-2-cyano-5-(trifluoromethoxy)pyridine-3-acetic acid
3-Chloro-2-(chloromethyl)-6-(trifluoromethoxy)pyridine-4-acetic acid
2-Chloro-6-(chloromethyl)-5-(trifluoromethoxy)pyridine-3-acetic acid
2-Chloro-4-(chloromethyl)-3-(trifluoromethoxy)pyridine-6-acetic acid