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