1. Department of Chemistry and ‡School of Pharmaceutical
Sciences, Tsinghua University, Beijing 100084, P. R. China
2. The State Key Laboratory
Breeding Base-Shenzhen Key Laboratory of
Chemical Biology, Graduate School at Shenzhen, ∥Open FIESTA Center, and ⊥The Key Lab
in Health Science and Technology, Division of Life Science, Graduate
School at Shenzhen, Tsinghua University, Shenzhen 518055, P. R. China