1. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
2. Department of Chemistry, New York University, New York, NY, 10003, USA
3. Simons Center for Computational Physical Chemistry at New York University, USA
4. NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai, 200062, China