1. Department of Process Research, Merck, 16711 Autoroute Transcanadienne, Kirkland, Québec, Canada H9H 3L1
2. Department of Process Research, Merck, P.O. Box 2000, Rahway, New Jersey 07065, United States
3. Department of Process Research Chemistry, Actelion Pharmaceuticals Ltd., Gewerbestrasse 16, 4123 Allschwil, Switzerland