1. Department of Bioinspired Science
and College of Pharmacy, Ewha Womans University, Seoul 120-750, Korea
2. College of Pharmacy, Dongguk University,
Kyungki-do 410-774, Korea
3. College of Pharmacy, Seoul National
University, Seoul 151-742, Korea
4. College of Chemistry and Chemical
Engineering, Liaoning Normal University, Dalian 116-029, China
5. Rexan Pharmaceuticals, Inc., Bethesda,
Maryland 20850, United States