1. Department of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, Florida 33458, United States
2. Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
3. Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
4. Department of Pharmacology, Yale School of Medicine, New Haven, Connecticut 06520, United States