1. Daiichi Sankyo Co., Ltd. 1-2-58, Hiromachi, Shinagawa-ku Tokyo 140-8710 Japan
2. Unnatural Products, Inc. 250 Natural Bridges Drive Santa Cruz CA 95060 USA
3. Department of Pharmaceutical Chemistry University of California, San Francisco San Francisco California 94158 USA
4. Department of Chemistry & Biochemistry University of California Santa Cruz Santa Cruz CA 96064 USA
5. Discovery Technology Laboratories Mitsubishi Tanabe Pharma Corporation Yokohama 227-0033 Japan