1. College of Pharmacy and Research Institute of Life and Pharmaceutical Sciences, Sunchon National University, Suncheon 57922, Republic of Korea
2. Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
3. Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
4. Center of Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0204, USA