6-(Fluoromethyl)-2-hydroxy-3-nitro-4-(trifluoromethoxy)pyridine
2-(Fluoromethyl)-6-hydroxy-4-nitro-3-(trifluoromethoxy)pyridine
3-(Chloromethyl)-2-(difluoromethyl)-4-fluoro-6-(trifluoromethoxy)pyridine
3-Hydroxy-5-methoxy-2-nitro-4-(trifluoromethoxy)pyridine