1. Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Science, and Laboratory of Chemical Genomics, Shenzhen Graduate School, Peking University, Beijing 100871, China, and Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom