5-Hydroxy-3-nitro-4-(trifluoromethoxy)pyridine-2-sulfonyl chloride
3-Hydroxy-5-nitro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
4-Hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-5-acetic acid
3-Hydroxy-4-nitro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride