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