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