1. Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
2. Faculty of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian 223003, People’s Republic of China
3. Institute of Inorganic and Structural Chemistry, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
4. Institute of Physiological Chemistry, Universitätsmedizin der Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
5. Department of Chemistry, Faculty of Science, University of Douala, PO Box 24157, Douala, Cameroon