2-Cyano-3-nitro-5-(trifluoromethoxy)pyridine-6-sulfonamide
5-Cyano-3-(difluoromethyl)-2-(trifluoromethoxy)pyridine-4-methanol
2-Chloro-3-nitro-6-(trifluoromethoxy)pyridine-4-sulfonyl chloride
2-Cyano-3-nitro-4-(trifluoromethoxy)pyridine-5-sulfonamide