1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China) Hunan Normal University Changsha P.R. China
2. Department of Chemistry, College of Chemistry and Chemical Engineering Hunan Normal University Changsha P.R. China
3. Department of Chemistry, School of Chemistry and Chemical Engineering Nanjing University Nanjing P.R. China
4. Research Computing Centre University of North Carolina Chapel Hill North Carolina