2-Hydroxy-5-nitro-4-(trifluoromethoxy)pyridine-3-sulfonyl chloride
5-Fluoro-4-nitro-2-(trifluoromethoxy)pyridine-3-methanol
6-Hydroxy-4-nitro-2-(trifluoromethoxy)pyridine-3-sulfonyl chloride
2-Hydroxy-4-nitro-5-(trifluoromethoxy)pyridine-3-sulfonyl chloride