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