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