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