1. Institute of Chemistry, Chung Yuan Christian University, Chung-Li, Tao-Yuan Hsien, Taiwan, Republic of China, National Research Institute of Chinese Medicine, No. 155-1, Sec. 2, Li-Nung Street, Peitou, Taipei, 112, Taiwan, Republic of China, and Ko Da Pharmaceutical Co., Ltd., No. 20-1, Industrial 3 Road, Ping-Cheng City, Tao-Yuan Hsien, Taiwan, Republic of China