3-Cyano-6-nitro-4-(trifluoromethoxy)pyridine-2-sulfonyl chloride
4-Cyano-3-nitro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
4-Cyano-2-nitro-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Fluoro-4-hydroxy-5-methyl-3-(trifluoromethoxy)pyridine