6-O-sulfated heparin

During synthesis the HS chains are selectively sulfated at the N, 6-O, and 3-O positions of the glucosamine (GlcNS) and at the 2-O position of the uronic acid residue by HS sulfotransferases and modified by C5-epimerization of glucuronic acid (GlcA) to iduronic acid (IdoA)