1. Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
2. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
3. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
4. Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA