Methyl 3-(chloromethyl)-2-cyano-6-(trifluoromethoxy)pyridine-5-acetate
Methyl 2-chloro-3-(difluoromethyl)-4-(trifluoromethoxy)pyridine-5-acetate
Methyl 4-cyano-2-(fluoromethyl)-3-(trifluoromethoxy)pyridine-5-acetate
Methyl 5-cyano-3-(fluoromethyl)-4-(trifluoromethoxy)pyridine-2-acetate