1. Department of Pharmaceutical Chemistry and Bioanalytics; Institute of Pharmacy; Martin-Luther University Halle-Wittenberg; Wolfgang-Langenbeck-Str. 4 06120 Halle/Saale Germany
2. Department Mass Spectrometry; Institute of Organic Chemistry; University of Cologne; Greinstraße 4 50939 Cologne Germany
3. Department of Technical Biochemistry; Institute of Biochemistry and Biotechnology; Martin-Luther University Halle-Wittenberg; Kurt-Mothes-Str. 3 06120 Halle/Saale Germany