1. Biological Institute, University of Tokyo, Komaba, Meguro, Tokyo, Japan
2. Department of Entomology, National Institute of Health, Kamiosaki, Shinagawa, Tokyo
3. Laboratory of Chemistry for Natural Products, Tokyo Institute of Technology, Ohkayama, Meguro, Tokyo
4. Research Laboratories, Pharmaceutical Division, Nippon Kayaku Company, Simo, Kita, Tokyo