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