1. Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan R.O.C.
2. Department
of Chemistry, National Chung Hsing University, Taichung 402, Taiwan R.O.C.
3. Department
of Chemistry, National Sun Yat-Sen University, Kaohsiung 804, Taiwan R.O.C.