– 2-Deoxy-2-fluoro-L-fucose is a fucosylation inhibitor that inhibits the de novo synthesis of GDP-fucose in mammalian cells, effectively inhibits the proliferation of human cancer and primary endothelial cells, and has potential as an angiogenic therapeutic agent. It also inhibits fucosylation of plant cell wall polysaccharides, particularly affecting the dimerization of the pectin-like polysaccharide RG-II, thereby inhibiting root growth and cell elongation.2-Deoxy-2-fluoro-L-fucose also reduces the phosphorylation of Smad 1/5 and Smad 2 in 4T1 cells.