Methyl 2-amino-4-(aminomethyl)-5-(difluoromethyl)pyridine-3-acetate
Methyl 2-amino-3-(aminomethyl)-6-(difluoromethyl)pyridine-5-acetate
4-Amino-5-(aminomethyl)-2-(difluoromethyl)pyridine-3-acetic acid
5-Amino-3-(aminomethyl)-2-(difluoromethyl)pyridine-4-acetic acid