3-Bromo-4-(difluoromethyl)-5-nitropyridine-2-carboxylic acid
3-Chloro-4-(difluoromethyl)-2-fluoro-5-nitropyridine
3-Bromo-4-(difluoromethyl)-5-(trifluoromethyl)pyridine-2-carboxylic acid
3-(Aminomethyl)-4-bromo-6-(difluoromethyl)pyridine-2-acetic acid