1. Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States,
2. Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States,
3. Skaggs School of Pharmacy and Pharmaceutical Science, University of California, San Diego, La Jolla, California 92093, United States