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