About the Authors

Rui Chang

Affiliation Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, United States of America

Robert Shoemaker

Affiliation Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, United States of America

Wei Wang

wei-wang@ucsd.edu

Affiliation Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RC WW. Performed the experiments: RC. Analyzed the data: RC WW. Contributed reagents/materials/analysis tools: RC RS WW. Wrote the paper: RC WW.