1. Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
2. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
3. Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
4. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States