3-Hydroxy-4-nitro-6-(trifluoromethoxy)pyridine-2-carboxylic acid
2-Fluoro-3-(fluoromethyl)-6-nitro-5-(trifluoromethoxy)pyridine
3-(Bromomethyl)-4-fluoro-2-nitro-5-(trifluoromethoxy)pyridine
2-Fluoro-3-(fluoromethyl)-5-nitro-4-(trifluoromethoxy)pyridine