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