4-Hydroxy-6-nitro-2-(trifluoromethoxy)pyridine-3-sulfonamide
4-Hydroxy-2-nitro-6-(trifluoromethoxy)pyridine-3-sulfonyl chloride
4-Hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride
3-Hydroxy-4-nitro-2-(trifluoromethoxy)pyridine-6-sulfonyl chloride