1. Department of Medicinal and Applied Chemistry, College of Life Science, Kaohsiung Medical University, Kaohsiung City 807, Taiwan
2. Institute of Clinical Medicine, National Cheng-Kung University, School of Medicine, 138 Sheng-Li Road, Tainan 704, Taiwan
3. Institute of Biotechnology, National University of Kaohsiung, 700 Kaohsiung University Road, Kaohsiung, Taiwan