1. Department
of Chemistry, University of California, Irvine, California 92697, United States
2. Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
3. Department
of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Institut
de Química Computacional i Catàlisi and Departament
de Química, Universitat de Girona, 17003 Girona, Spain
5. ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain