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