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