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