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