5-Bromo-6-chloro-3-indolyl a-D-galactopyranoside is a bioluminescent substrate that can be used in the detection of ?-galactosidase activity. It has been shown to be an effective ligand for some proteins and can be used as a fluorogenic substrate in fluorescence assays. 5Bromo-6Chloro-3Indolyl a-DGalactopyranoside is an excellent reagent for the measurement of galactose oxidase enzymes and it has also been used as a chromogenic substrate in the assay of ? D glucosidase. This product is available in high purity and high quality, ready for use in many different applications.