2-(Difluoromethyl)-3-hydroxy-4-nitro-6-(trifluoromethoxy)pyridine
5-(Fluoromethyl)-2-hydroxy-3-nitro-6-(trifluoromethoxy)pyridine
4-Hydroxy-6-methyl-2-(trifluoromethoxy)pyridine-3-methanol
4-(Fluoromethyl)-3-hydroxy-2-nitro-6-(trifluoromethoxy)pyridine