1. Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, Richmond, Virginia 23298-0540, United States
2. Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, University of the Sciences, 600 S 43rd Street, Philadelphia, Pennsylvania 19104-4495, United States
3. Institute of Arctic Biology, Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, Alaska 99775-7000, United States