5-Amino-2-(bromomethyl)-4-(difluoromethyl)pyridine-3-carboxylic acid
4-Amino-5-(bromomethyl)-2-(difluoromethyl)pyridine-3-carboxylic acid
4-Amino-3-(bromomethyl)-2-(difluoromethyl)-5-nitropyridine
5-Amino-2-(bromomethyl)-3-(difluoromethyl)pyridine-4-carboxylic acid