3-Amino-4-(difluoromethyl)-2-hydroxypyridine-6-carboxylic acid
3-Amino-4-(difluoromethyl)-2-hydroxypyridine-5-carboxylic acid
3-Amino-2-(difluoromethyl)-6-hydroxypyridine-5-carboxylic acid
3-Amino-2-(difluoromethyl)-6-hydroxypyridine-4-carboxylic acid