1. Division
of Pharmaceutical Sciences, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
2. Department
of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
3. Department
of Molecular Therapeutics, The Scripps Research Institute, Jupiter, Florida 33458, United States
4. Natural
Products Library Initiative, The Scripps Research Institute, Jupiter, Florida 33458, United States