1. Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
2. Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, United States
3. University of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
4. Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
5. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
6. Purdue Center for Cancer Research, West Lafayette, Indiana 47907, United States