[1] Univ Gesamthsch Paderborn, Dept Chem, D-33098 Paderborn, Germany
[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Mikrobiol, D-31806 Braunschweig, Germany
[3] Univ Pisa, Dipartimento Chim & Chim Ind, I-56126 Pisa, Italy
[4] Univ Debrecen, Dept Organ Chem, H-4010 Debrecen, Hungary
[5] Hungarian Acad Sci, Res Grp Carbohydrates, H-4010 Debrecen, Hungary