4-(Fluoromethyl)-3-hydroxy-6-nitro-2-(trifluoromethoxy)pyridine
4-(Fluoromethyl)-2-hydroxy-3-nitro-6-(trifluoromethoxy)pyridine
3-(Fluoromethyl)-5-hydroxy-2-nitro-6-(trifluoromethoxy)pyridine
3-(Fluoromethyl)-4-hydroxy-6-nitro-2-(trifluoromethoxy)pyridine