1. Institute of Organic Chemistry, University of Würzburg, Am Hubland, Würzburg 97074, Germany
2. Department of Musculoskeletal Tissue Regeneration, University of Würzburg, Friedrich-Bergius-Ring 15, Würzburg 97076, Germany
3. Institute for Molecular Medicine, Proteome Research, University Hospital and Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf 40225, Germany