1. Department of Chemistry and Research Center of Smart Molecules; Rikkyo University; Nishi-Ikebukuro Toshima-ku, Tokyo 171-8501 Japan
2. Department of Life Science and Research Center for Life Science; Rikkyo University; Nishi-Ikebukuro Toshima-ku, Tokyo 171-8501 Japan
3. Faculty of Pharmaceutical Sciences; Tokushima Bunri University; Yamashiro-cho, Tokushima 770-8514 Japan
4. Kunming Institute of Botany; Chinese Academy of Science; Kunming 650201 P. R. China