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