1. Center
for Marine Natural Products and Drug Discovery, School of Earth and
Environmental Sciences, Seoul National University, NS-80, Seoul 151-747, Korea
2. College
of Pharmacy, Yeungnam University, Gyeongsangbuk-do 712-749, Korea
3. Department
of Chemistry and Nano Science, Global Top 5 Program, Ewha Womans University, Seoul 120-750, Korea
4. Research
Institute of Oceanography, Seoul National University, Seoul 151-742, Korea