An indolyl carbohydrate that is the β-D-galactoside of 3-hydroxy-1H-indole in which the indole moiety is substituted at positions 4 and 5 by chlorine and bromine, respectively. It is used to test for the presence of an enzyme, β-galactosidase, which cleaved the glycosidic bond to give 5-bromo-4-chloro-3-hydroxy-1H-indole, which immediately dimerises to give an intensely blue product.
This entity has been manually annotated by the ChEBI Team.
Colourless, endogenous or exogenous pigment precursors that may be transformed by biological mechanisms into coloured compounds. They are used in biochemical assays and in diagnosis as indicators, particularly in the form of enzyme substrates.