Ethyl 3-amino-4-(aminomethyl)-6-(difluoromethyl)pyridine-2-carboxylate
Ethyl 3-amino-4-(aminomethyl)-2-(difluoromethyl)pyridine-6-carboxylate
3-Amino-6-(chloromethyl)-2-(difluoromethyl)-4-methylpyridine
6-Amino-4-(aminomethyl)-3-(difluoromethyl)pyridine-2-acetic acid