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