6-(Aminomethyl)-2-bromo-4-(difluoromethyl)pyridine-3-carboxylic acid
2-(Aminomethyl)-6-bromo-3-(difluoromethyl)pyridine-5-carboxylic acid
4-Chloro-2-(chloromethyl)-5-(difluoromethyl)-3-fluoropyridine
4-Chloro-2-(chloromethyl)-3-(difluoromethyl)-5-fluoropyridine