Ethyl 4-hydroxy-3-methoxy-2-(trifluoromethoxy)pyridine-5-carboxylate
Methyl 3-hydroxy-4-methoxy-2-(trifluoromethoxy)pyridine-6-acetate
Methyl 3-hydroxy-2-methoxy-6-(trifluoromethoxy)pyridine-4-acetate
Methyl 3-hydroxy-2-methoxy-4-(trifluoromethoxy)pyridine-6-acetate