1. Department of Pharmaceutical Chemistry and Bioanalytics, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
2. Center for Structural Mass Spectrometry, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
3. Institute for Molecular Medicine, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
4. Department of Physical and Chemical Sciences, University of L’Aquila, 67100 L’Aquila, Italy
5. Department of Genome Sciences, University of Washington, Seattle, Washington 98195, United States
6. Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States