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