1. Department of Chemistry, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwan
2. Graduate Institute of Natural Products, Chang Gung University, Taoyuan 333, Taiwan
3. Mass Solutions Technology Co., Ltd., Taipei 221, Taiwan
4. Chinese Medicinal Research and Development Center, China Medical University and Hospital, Taichung 40402, Taiwan