Methyl 2-hydroxy-6-methoxy-3-(trifluoromethoxy)pyridine-4-acetate
Methyl 2-hydroxy-4-methoxy-5-(trifluoromethoxy)pyridine-3-acetate
Methyl 6-hydroxy-4-methoxy-3-(trifluoromethoxy)pyridine-2-acetate
4-Hydroxy-5-methoxy-3-(trifluoromethoxy)pyridine-2-acetic acid