Ethyl 2-hydroxy-3-nitro-4-(trifluoromethoxy)pyridine-6-acetate
Methyl 4-hydroxy-3-nitro-6-(trifluoromethoxy)pyridine-2-acetate
Methyl 4-hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-6-acetate
2-Hydroxy-4-nitro-3-(trifluoromethoxy)pyridine-5-carboxylic acid