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