Acknowledgments
This work was supported by the National Natural Science Foundation of China grants [31270830 and 21572038 to Y. Dang; 81870990 to B. Lu], the Development Fund for Shanghai Talents, Fund of State Key Laboratory of Bioorganic and Natural Products Chemistry, Fund of State Key Laboratory of Drug Research and Chinese Academy of Science [SIMM1601KF-08]. The authors acknowledge instructive advises and support from Professor Jun O. Liu from Johns Hopkins University and Professor Jianzhong Yu from KANSAS.