1. Department of Chemistry, University of Alberta, Edmonton T6G 2G2, Canada
2. Univ. Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale (IBS), 38000 Grenoble, France
3. Structural Biology Group, European Synchrotron Radiation Facility, 38043 Grenoble, France
4. Department of Chemistry, University of Tokyo, Tokyo 113-0033, Japan