pseudo-vancomycin with new sugar attachments in mono- and di-saccharide form have been enzymatically synthesized by glycosylation with overexpressed glycosyltransferases, β1,4-galactosyltransferase and α2,3-sialyl transferases. All four analogs, including galactose-containing derivatives (6 and 8) and galactose- and sialic acid-containing derivatives (7 and 9) were prepared and characterized by HPLC