5-Hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-4-sulfonamide
5-Fluoro-2-(trifluoromethoxy)-3-(trifluoromethyl)pyridine-4-methanol
4-Hydroxy-5-nitro-3-(trifluoromethoxy)pyridine-2-sulfonamide
5-Hydroxy-2-methyl-3-(trifluoromethoxy)pyridine-6-carboxylic acid