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