5-Amino-2-(difluoromethyl)-4-(trifluoromethyl)pyridine-3-carboxylic acid
4-Amino-3-(chloromethyl)-2-(difluoromethyl)pyridine-5-carboxylic acid
4-Amino-5-(difluoromethyl)-2-(trifluoromethyl)pyridine-3-carboxylic acid
4-Amino-6-(difluoromethyl)-2-(trifluoromethyl)pyridine-3-carboxylic acid