1. Laboratory of Chemical Genomics, Shenzhen Graduate School of Peking University, Shenzhen, China, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, State Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China, and Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China