1. Department of Chemistry, Stanford University, Stanford, California 94305, United States
2. Department of Chemistry, New York University, New York, New York 10003, United States
3. Courant Institute of Mathematical Science, New York University, New York, New York 10012, United States
4. NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China