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