1. Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
2. Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907, United States
3. Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
4. Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States