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