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