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