Methyl 6-chloro-4-(difluoromethyl)-2-fluoropyridine-3-carboxylate
Methyl 4-bromo-2-(bromomethyl)-6-(difluoromethyl)pyridine-3-carboxylate
Methyl 6-chloro-4-(difluoromethyl)-3-fluoropyridine-2-carboxylate
Methyl 4-bromo-2-(bromomethyl)-5-(difluoromethyl)pyridine-3-carboxylate