1. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
2. Department of Pharmacy, Ludwig-Maximilians-University, 81377 Munich, Germany
3. Molecular Engineering Laboratory, Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
4. Department of Physics, University of California, Santa Barbara, California 93106, United States