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