1. Research Centre Applied Biocatalysis, Petersgasse 14, A-8010 Graz, Austria, DSM Pharma Chemicals Regensburg GmbH, RESCOM, Donaustaufer Strasse 378, D-93055 Regensburg, Germany, DSM Research, Advanced Synthesis Catalysis & Development, P.O. Box 18, 6160 MD Geleen, The Netherlands, and DSM Fine Chemicals Austria NfG GmbH & Co KG, R & D Center Linz, St.-Peter-Strasse 25, A-4021 Linz, Austria