Methyl 2-cyano-5-(difluoromethyl)-3-(trifluoromethoxy)pyridine-4-acetate
Methyl 2-cyano-3-(difluoromethyl)-5-(trifluoromethoxy)pyridine-6-acetate
4-Cyano-5-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-acetic acid
4-Cyano-6-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-acetic acid