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