1. Chemistry Research Laboratory, Department of Chemistry and the Ineos Oxford Institute for Antimicrobial Research, University of Oxford, 12 Mansfield Road, OX1 3TA, Oxford, United Kingdom
2. State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Design and Optimization and Department of Chemistry, China Pharmaceutical University, Nanjing 211198, China
3. Institute of Natural Medicine, University of Toyama, 2630-Sugitani, 930-0194, Toyama, Japan