4-Nitrophenyl 2-O-(β-L-Fucopyranosyl)-β-D-Galactopyranoside

4-Nitrophenyl 2-O-(β-L-Fucopyranosyl)-β-D-Galactopyranoside is a synthetic chromogenic substrate and can be used in the assay of α-fucosidases which hydrolyze the glycosidic linkage Fuc α1-2Gal. The assay is based on the sequential action of α-fucosidase and an exogenously added exo-β-d-galactosidase to release the easily measurable p-nitrophenol moiety.