Purity >98%. L-(-)-Fucose is a deoxyhexose monosaccharide found on N- and O-linked glycans and glycolipids of a wide variety of organisms. It can exist as a terminal modification of glycan structures or serve as a point of attachment for adding other sugars. In humans, L-(-)-fucose plays a role in A and B blood group antigen substructure determination, selectin-mediated leukocyte-endothelial adhesion, and host-microbe interactions.