3-Cyano-6-(difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine
4-Cyano-6-(difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine
3-Cyano-5-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine
3-Fluoro-2-(fluoromethyl)-4-(trifluoromethoxy)pyridine-6-acetonitrile