4-Nitrophenyl 2-acetamido-3-O-(2-acetamido-2-deoxy-b-D-glucopyranosyl)-2-deoxy-a-D-galactopyranoside is a high quality, fluorogenic substrate for the detection of ? D glucosidase. This product is used in the culture media for the conjugation of enzymes and as a substrate for enzyme assays. 4NPPGALA can be used as a ligand in immunoassays and has been shown to have strong chromogenic properties. It is also useful in the diagnosis of diseases related to food, environmental testing, and staining.