1. Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United
States
2. Department
of Pharmacology, University of Pennsylvania Perelman, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United
States
3. Center for Physical Sciences and Technology, Vilnius, Lithuania
4. Department of Chemistry
and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, United States