4-(Difluoromethyl)-2-fluoro-5-nitro-3-(trifluoromethoxy)pyridine
5-(Difluoromethyl)-3-fluoro-2-nitro-4-(trifluoromethoxy)pyridine
3-Fluoro-6-(fluoromethyl)-2-(trifluoromethoxy)pyridine-4-methanol
6-Hydroxy-2-methoxy-3-(trifluoromethoxy)pyridine-4-acetic acid