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