Helmboldt, Arnim; Petitou, Maurice; Mallet, Jean-Maurice; Herault, Jean-Pascal; Lormeau, Jean-Claude; Driguez, Pierre Alexandre; Herbert, Jean-Marc; Sinay, Pierre Bioorganic and Medicinal Chemistry Letters, 1997, vol. 7, # 12 p. 1507 - 1510 doi: 10.1016/S0960-894X(97)00252-7