Ethyl 6-hydroxy-4-nitro-2-(trifluoromethoxy)pyridine-3-acetate
Methyl 2-hydroxy-4-(trifluoromethoxy)-6-(trifluoromethyl)pyridine-3-acetate
Ethyl 2-hydroxy-4-nitro-5-(trifluoromethoxy)pyridine-3-acetate
Ethyl 2-hydroxy-3-nitro-6-(trifluoromethoxy)pyridine-5-acetate