1. Department of Chemistry and the
Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla,
California 92037, United States
2. Department of Chemistry, Institute for Science and Supramolecular Engineering, 8 allée Gaspard Monge, 67000 Strasbourg,
France
3. Department of Organic
Chemistry, University of Geneva, Geneva
CH-1211, Switzerland
4. Department
of Molecular Biology, The Scripps Research Institute, 10550 North Torrey
Pines Road, La Jolla, California 92037, United States