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