Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA.|Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA.|Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA.|Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA.|Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA.|Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, USA.