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