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 Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
3. Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, United States