1. Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China
2. Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, Republic of China
3. National Institute of Cancer Research, National Health Research Institutes, Tainan 704, Taiwan, Republic of China
4. Department of Chemistry, Tunghai University, 181 Taichung Harbor Road Sec. 3, Taichung 407, Taiwan, Republic of China