Methyl 3-(bromomethyl)-2-cyano-6-(trifluoromethoxy)pyridine-5-acetate
Methyl 6-(bromomethyl)-2-cyano-3-(trifluoromethoxy)pyridine-4-acetate
Methyl 2-(bromomethyl)-5-cyano-6-(trifluoromethoxy)pyridine-3-acetate
Methyl 6-(bromomethyl)-4-cyano-2-(trifluoromethoxy)pyridine-3-acetate