1. Department of Chemistry, Organic and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria, and Research Centre Applied Biocatalysis, Petergasse 14, A-8010 Graz, Austria c/o Department of Chemistry, Organic and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28, A-8010, Graz, Austria