3-Cyano-2-nitro-4-(trifluoromethoxy)pyridine-6-sulfonyl chloride
3-Cyano-6-iodo-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Cyano-6-nitro-5-(trifluoromethoxy)pyridine-3-sulfonyl chloride
3-Fluoro-2-nitro-5-(trifluoromethoxy)pyridine-4-acetic acid