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