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