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