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