X-β-D-cellobioside (5-Bromo-4-chloro-3-indolyl-beta-D-cellobioside) is a chromogenic substrate for β-cellobiosidase. Enzymatic cleavage of the substrate generates a dark blue-colored precipitate. White solid soluble in DMSO Store at 4°C and protect from light C20H25BrClNO11 MW: 570.78 [177966-52-8]