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