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