1. Analytical Research & Development, MRL, Merck & Co., Inc. Rahway NJ 07065 USA
2. Department of Chemistry The Scripps Research Institute La Jolla CA 92037 USA
3. School of Chemistry University of Bristol Bristol BS8 1TS UK
4. Department of Chemistry Gustavus Adolphus College Saint Peter MN 56082 USA
5. School of Pharmaceutical Sciences University of Geneva, CMU Rue Michel-Servet 1 1211 Geneva 4 Switzerland
6. Institute of Pharmaceutical Sciences of Western Switzerland University of Geneva, CMU Rue Michel-Servet 1 1211 Geneva 4 Switzerland