1. Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan, Faculty of Pharmacy, College of Pharmacy, China Medical University, Taichung, 404, Taiwan, National Sun Yat-Sen University−Kaohsiung Medical University Joint Research Center, Kaohsiung 804, Taiwan, and Center of Excellence for Environmental Medicine, Kaohsiung Medical University, Kaohsiung 804, Taiwan, Republic of China