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