Methyl 2-amino-3-(chloromethyl)-5-(difluoromethyl)pyridine-6-carboxylate
Methyl 2-amino-6-(chloromethyl)-5-(difluoromethyl)pyridine-3-carboxylate
3-Amino-4-(aminomethyl)-5-(difluoromethyl)pyridine-2-carboxylic acid
3-Amino-2-(aminomethyl)-6-(difluoromethyl)pyridine-5-carboxylic acid