The occurrence of glycoconjugates (glycosphingolipids and glycoproteins) as integral constituents of membranes and cell walls has recently stimulated research activities [4, 7, 9, 12, 16, 17, 18, 19, 20]. Of special interest is the function of glycosphingolipids as cell-surface antigens, as in the Lewis antigen A-D determinants or the well-known H, A, B blood group determinants. Also, glycosphingolipids which accumulate in the surface of cancer cell membranes, referred to as “tumor associated antigens”, have gained interest [4, 7, 9, 12, 18]. Figure 1 outlines the complicated terminology of these compounds; it shows also that a large variety of different glycosphingolipids can be obtained by varying the sugar-sugar connections [19], thus rendering these compounds ideal as carriers of biological information.