Methyl 6-bromo-2-nitro-3-(trifluoromethoxy)pyridine-4-acetate
Methyl 2-bromo-3-nitro-6-(trifluoromethoxy)pyridine-5-acetate
Methyl 2-bromo-6-methyl-3-(trifluoromethoxy)pyridine-5-acetate
Methyl 4-bromo-2-methoxy-5-(trifluoromethoxy)pyridine-3-acetate