1. Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, An der Immenburg 4, 53121 Bonn, Germany
2. Institute of Bioanalytical Chemistry, Center for Biotechnology and Biomedicine, Leipzig University, Deutscher Platz 5, 04103 Leipzig, Germany
3. Department of Infection Biology, Institute of Medicine, University of Tsukuba, 1-1-1 Tennodai, 305-8575 Tsukuba, Ibaraki, Japan