4-(Chloromethyl)-2-cyano-6-(trifluoromethoxy)pyridine-3-acetic acid
3-(Chloromethyl)-4-cyano-6-(trifluoromethoxy)pyridine-2-acetic acid
3-Cyano-5-(fluoromethyl)-2-(trifluoromethoxy)pyridine-4-acetic acid
5-Cyano-4-(fluoromethyl)-3-(trifluoromethoxy)pyridine-2-acetic acid