1. The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
2. Bronx High School of Science, 75 W 205th Street, The Bronx, New York 10468, USA
3. Department of Chemistry, Fordham University, 441 E. Fordham Road, The Bronx, New York 10458, USA
4. Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
5. Department of Chemistry, Haverford College, 370 Lancaster Avenue, Haverford, Pennsylvania 19041, USA