1. Pritzker School of Molecular Engineering and Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA
2. Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA
3. Department of Chemistry and Biochemistry, Butler University, Indianapolis, Indiana 46208, USA
4. Department of Chemistry—BMC, Organic Chemistry, Uppsala University, SE-75123 Uppsala, Sweden