1. Ursapharm Arzneimittel GmbH; Industriestraße 35 Saarbrücken 66129 Germany
2. PharmBioTec GmbH; Science Park 1 Saarbrücken 66123 Germany
3. Helmholtz Institute for Pharmaceutical Research Saarland, Department of Microbial Natural Products, Helmholtz Centre for Infection Research and Pharmaceutical Biotechnology at Saarland University; Saarbrücken 66041 Germany