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