5-bromo-4-chloro-3-indolyl alpha-D-galactoside is an indolyl carbohydrate that is the alpha-D-galactoside of indoxyl in which the indole moiety is substituted at positions 4 and 5 by chlorine and bromine, respectively. It is an organobromine compound, an organochlorine compound, an indolyl carbohydrate, a D-aldohexose derivative and an alpha-D-galactoside. It derives from an indoxyl.