1. Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
2. Department of Oncological Sciences, University of Utah, Huntsman Cancer Institute, Salt Lake City, Utah 84112, United States
3. Natural Products Research Institute, College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
4. College of Pharmacy, Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Incheon 21983, Republic of Korea