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