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