Ethyl 2-(aminomethyl)-4-cyano-5-(difluoromethyl)pyridine-3-carboxylate
Ethyl 6-(aminomethyl)-4-(difluoromethyl)-2-iodopyridine-3-carboxylate
Ethyl 4,6-difluoro-2-(difluoromethyl)pyridine-3-carboxylate
Ethyl 2,4-difluoro-5-(difluoromethyl)pyridine-3-carboxylate