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