Methyl 4-fluoro-3-nitro-2-(trifluoromethoxy)pyridine-5-acetate
Methyl 3-fluoro-4-nitro-2-(trifluoromethoxy)pyridine-6-carboxylate
Methyl 4-fluoro-2-nitro-3-(trifluoromethoxy)pyridine-5-acetate
Methyl 3-fluoro-2-nitro-4-(trifluoromethoxy)pyridine-6-carboxylate