Ethyl 2-amino-6-(aminomethyl)-3-(difluoromethyl)pyridine-4-carboxylate
Ethyl 6-amino-3-(aminomethyl)-4-(difluoromethyl)pyridine-2-carboxylate
2-Amino-3-(aminomethyl)-4-(difluoromethyl)pyridine-6-carboxylic acid
Ethyl 3-amino-2-(aminomethyl)-6-(difluoromethyl)pyridine-4-carboxylate