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