1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Hunan Normal University, Changsha, Hunan 410081, China
2. Beijing Kein Research Center for Natural Sciences, Beijing 100022, China
3. Research Computing Center, University of North Carolina, Chapel Hill, North Carolina 27599-3420, United States
4. Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
5. Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India