1. Department of Pharmaceutical Biology, University Centre for Pharmacy, Groningen Institute for Drug Studies (G ID S ), University of Groningen, A. Deusinglaan 1, NL-9713 AV G roningen, The Netherlands
2. Department of Pharmaceutical Biology, University Centre for Pharmacy, Groningen Institute for Drug Studies (G ID S ), University of Groningen, A. Deusinglaan 1, NL-9713 AV Groningen, The Netherlands
3. Department of Pharmaceutical Biology, University Centre for Pharmacy, Groningen Institute for Drug Studies (G IDS), University of Groningen, A. Deusinglaan 1, NL-9713 AV G roningen, The Netherlands
4. Department of Organic and Molecular Inorganic Chemistry, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen
5. Department of Organicand Molecular Inorganic Chemistry, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen
6. Division of Pharmacognosy Leiden/Amsterdam Centerfor Drug Research, Leiden University, Gorlaeus Laboratories, PO Box 9502, NL-2300 RA Leiden, The Netherlands