1. Industry and Academic Cooperation Laboratory for Drug Development, Mokpo National University, Muan, Jeonnam 534-729, Republic of Korea
2. Department of Medicinal Chemistry, Hyundai Pharma, Suwon, Gyeonggi 443-270, Republic of Korea
3. Department of Entomology and University of California Davis Cancer Center, University of California, One Shields Avenue, Davis, California 95616, United States
4. Department of Applied Bioscience, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan