1. Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368, United States
2. Department of Chemical Development, Boehringer Ingelheim Pharma GmbH & Co, KG, Bingerstrasse 173, Ingelheim am Rhein 55218, Germany
3. Department of Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368, United States