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