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