1. Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
2. Shenzhen Key Laboratory of Marine Biotechnology and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China
3. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794, United States
4. Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom