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