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