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