4-(Chloromethyl)-2-cyano-3-(trifluoromethoxy)pyridine-5-carboxylic acid
5-(Chloromethyl)-3-cyano-4-(trifluoromethoxy)pyridine-2-carboxylic acid
3-(Chloromethyl)-5-cyano-2-(trifluoromethoxy)pyridine-4-carboxylic acid
5-(Chloromethyl)-4-cyano-3-(trifluoromethoxy)pyridine-2-carboxylic acid