1. College of Pharmacy, Yeungnam University, 214-1 Dae-dong, Gyeongsan, Korea, 712-749, College of Pharmacy, Catholic University of Daegu, 330 Geumnak 1-ri, Gyeongsan, Korea, 712-702, and Department of Biochemistry, College of Science, Yeungnam University, 214-1 Dae-dong, Gyeongsan, Korea, 712-749