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