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