2-Amino-3-(difluoromethyl)-6-nitropyridine-4-sulfonamide
2-Amino-4-(aminomethyl)-3-(difluoromethyl)pyridine-6-acetonitrile
2-Amino-6-(aminomethyl)-4-(difluoromethyl)pyridine-3-acetonitrile
2-Amino-3-(aminomethyl)-6-(difluoromethyl)pyridine-4-acetonitrile