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