1. School of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan 807, Republic of China, Ta-Jen Institute of Technology, Ping Tung Hsieng, Taiwan 907, Republic of China, Department of Forest Resource, Management and Technology, National Pintung University of Science and Technology, Pintung Hsien, Taiwan 912, Republic of China, and Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan 804, Republic of China