1. Laboratorium für Organische Chemie, D-CHAB; ETH Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Switzerland
2. Discovery Chemistry, PRCB; F. Hoffmann-La Roche AG; Grenzacherstr. 124 4070 Basel Switzerland
3. Biozentrum; University of Basel; Klingelbergstr, 50/70 4056 Basel Switzerland