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