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