1. Department of Pharmaceutical Chemistry; Faculty of Life Sciences; University of Vienna; Althanstraße 14 1090 Vienna Austria
2. Department of Medicinal Chemistry; Medical University Vienna; Währingerstraße 10 1090 Vienna Austria
3. Department of Medical Biochemistry; Max F. Perutz Laboratories; Medical University Vienna; Dr. Bohr-Gasse 9/2 1030 Vienna Austria