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