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