1. Department of Technical Chemistry and Biotechnology, Institute of Chemistry and Biochemistry, Greifswald University, Soldmannstr. 16, D-17487 Greifswald, Germany, Laboratory of Organic Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis, GR-15771, Athens, Greece, and Chemical Laboratories, Agricultural University of Athens, Iera Odos 75, Athens 11855, Greece gkokotos@cc.uoa.gr; uwe.bornscheuer@uni-greifswald.de