1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
3. Department of Chemistry, New York University, New York, New York 10003, United States
4. NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China