β-D-Lactopyranosylphenyl isothiocyanate is a biochemical reagent used in glycobiology research. Glycobiology involves the study of the structure, synthesis, biological properties and evolution of sugars, including carbohydrate chemistry, enzymology of glycan formation and degradation, protein-glycan mutual recognition and the role of glycans in biological systems. This field is closely related to basic research, biomedicine and biotechnology.