Patent: Protecting Groups Useful In The Synthesis of Polysaccharides, Natural Products, And Combinatorial Libraries. 20Patent Authors: Buchwald, S.L.; Plante, O.J.; Seeberger, P.H.U.S. Patent No. 6,426,451B1Date Issued: July 30, 2002Patent Title: Protecting Groups Useful In The Synthesis of Polysaccharides, Natural Products, And Combinatorial Libraries.