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