About the Authors

Regula E Halbeisen

Affiliation Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland

André P Gerber

To whom correspondence should be addressed. E-mail: andre.gerber@pharma.ethz.ch

Affiliation Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

REH and APG conceived and designed the experiments. REH performed the experiments. REH and APG analyzed the data. REH and APG contributed reagents/materials/analysis tools. REH and APG wrote the paper.