1. Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, National Research Institute of Chinese Medicine, Taipei, Taiwan 112, Department of Food Science, Nutrition and Nutraceutical Biotechnology, Shih Chien University, Taipei, Taiwan 104, Kang Jian Biotech Corp., Ltd., Nantou, Taiwan 542, Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medicine University, Kaohsiung, Taiwan 807, and Department of Biotechnology, Ta Jen University, Pintung, Taiwan 907, Republic of China