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
4-Hydroxy-6-nitro-3-(trifluoromethoxy)pyridine-2-acetic acid