1. Department
of Chemistry, BioScience Research Collaborative, Rice University, 6100
Main Street, Houston, Texas 77005, United States
2. Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
3. Bristol-Myers Squibb Research & Development, 700 Bay Road, Redwood City, California 94063, United States
4. Bristol-Myers Squibb Research & Development, Princeton, New Jersey 08543-4000, United States
5. Laboratory of Natural Products Synthesis & Bioorganic Chemistry, Institute of Nanoscience & Nanotechnology, National Centre of Scientific Research “Demokritos”, Agia Paraskevi GR-15310, Greece