1. Department of Chemistry, National Sun Yat-Sen University, No. 70, Lien-Hai Road, Kaohsiung 804, Taiwan
2. School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan
3. Institute of Medical Science and Technology & International PhD Program for Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan