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