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