1. Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, United States
2. Department of Chemistry, John Brown University, 2000 West University Street, Siloam Springs, Arkansas 72761, United States
3. Department of Biochemistry and Biophysics, Texas A&M University, 3112 TAMU, College Station, Texas 77842, United States
4. Department of Chemistry, King’s College London, 7 Trinity Street, London SE1 1DB, U.K.
5. Department of Computer Science and Engineering, Texas A&M University, 3112 TAMU, College Station, Texas 77842, United States
6. Center for Computational Quantum Chemistry, Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602-2556, United States