1. College of Pharmacy, Chungnam National University, Daejeon 305-764, Korea, Department of Molecular Medicine, Kyungpook National University, Daegu 700-422, Korea, College of Pharmacy, Catholic University of Daegu, Kyungbook 712-702, Korea, Department of Oriental Pharmacy, Wonkwang University of Iksan, Jeonbuk 570-749, Korea, College of Pharmacy, Yeungnam University, Gyeongbuk 712-749, Korea, and Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan