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