1. AstraZeneca Oncology R&D, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
2. Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
3. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
5. Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States