3-Cyano-6-(fluoromethyl)-4-(trifluoromethoxy)pyridine-2-carboxylic acid
5-Cyano-2-(fluoromethyl)-3-(trifluoromethoxy)pyridine-4-carboxylic acid
3-Cyano-5-methyl-2-(trifluoromethoxy)pyridine-6-acetic acid
4-Cyano-5-(fluoromethyl)-3-(trifluoromethoxy)pyridine-2-carboxylic acid