1. Chemical
Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
2. Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
3. Medicinal Chemistry, Boehringer Ingelheim Pharma GmbH & Co. KG, Birkendorfer Strasse 65, 88397 Biberach/Riss, Germany