4-Chloro-6-(difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine
4-Chloro-2-(difluoromethyl)-5-nitro-3-(trifluoromethoxy)pyridine
5-Chloro-3-(difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine
2-Cyano-6-fluoro-4-(trifluoromethoxy)pyridine-3-carboxylic acid