1. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100 Shi-Chuan 1st Rd., San-Ming District, Kaohsiung 807, Taiwan
2. Department of Chemistry, National Sun Yat-Sen University No. 70, Lienhai Rd., Kaohsiung 804, Taiwan
3. Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan