Ethyl 5-amino-2-(aminomethyl)-3-(difluoromethyl)pyridine-6-carboxylate
Ethyl 4-amino-3-(aminomethyl)-6-(difluoromethyl)pyridine-2-carboxylate
2-Amino-5-(difluoromethyl)-3-methylpyridine-6-methanol
Ethyl 4-amino-3-(aminomethyl)-2-(difluoromethyl)pyridine-6-carboxylate