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