5-Hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-6-sulfonamide
4-Hydroxy-3-nitro-6-(trifluoromethoxy)pyridine-2-sulfonamide
4-Hydroxy-5-methoxy-2-(trifluoromethoxy)pyridine-3-sulfonyl chloride
4-Fluoro-2-nitro-6-(trifluoromethoxy)pyridine-3-carboxylic acid