1. Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung 807, Taiwan, Republic of China, Department of Biochemistry, Faculty of Science, Okayama University of Science, Okayama 700-0005, Japan, Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute at Frederick, National Institutes of Health, Frederick, Maryland 21702, and Natural Products Laboratory, School of Pharmacy, University of North Carolina,...