1. Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., P.O. Box 368, Ridgefield, Connecticut 06877, United States
2. Department of Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., P.O. Box 368, Ridgefield, Connecticut 06877, United States
3. Boehringer Ingelheim RCV GmbH & Co KG, 1121 Vienna, Austria