1 Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064.
2 Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093.
3 Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093.
4 Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093; wgerwick@ucsd.edu rliningt@sfu.ca.
5 Department of Chemistry, Simon Fraser University, Burnaby, BC, Canada, V5A 1S6 wgerwick@ucsd.edu rliningt@sfu.ca.