1. Department of Applied Chemistry, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsinchu 300-10, Taiwan, Republic of China
2. Department of Chemistry, MES Abasaheb Garware College, Pune, India
3. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100 Shih-Chuan First Road, Kaohsiung 807-08, Taiwan, Republic of China