1. Department of Chemistry—BMC, Uppsala University, P.O. Box 576, SE-751 23 Uppsala, Sweden
2. Centre for Antibiotic Resistance Research (CARe) at the University of Gothenburg, P.O. Box 440, SE-405 30 Gothenburg, Sweden
3. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, 710127 Xi’an, P. R. China