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